Flex Top King Mattress: What It Is, Comfort Features, and Shopping Guide 2025

A Flex Top King mattress has a split at the top, allowing each side to adjust independently. This feature offers couples personalized comfort and firmness. Known as a split top design, it is compatible with various bed frames, making it a versatile choice for different sleep preferences.

Comfort features of the Flex Top King Mattress include memory foam layers that conform to the body. This foam provides pressure relief and support, helping to alleviate aches. Additionally, many models incorporate cooling technologies to regulate temperature and enhance the sleeping experience. The edge support system also reinforces the mattress perimeter, offering stability for sitting or sleeping near the edges.

When shopping for a Flex Top King Mattress, consider factors such as firmness level, material quality, and warranty options. Many brands offer a trial period, allowing you to test the mattress before fully committing. Ensuring proper bed frame compatibility is also essential for optimal performance.

In conclusion, understanding the features and factors to consider in your purchase will guide you in selecting the best Flex Top King Mattress. Next, we will explore the advantages of flexible sleeping arrangements and how this mattress can enhance overall sleep quality.

Table of Contents

What is a Flex Top King Mattress?

A Flex Top King Mattress is a type of king-sized mattress that features a split design. This allows each side of the mattress to move independently, accommodating different comfort preferences for couples.

According to the Sleep Foundation, a Flex Top King mattress combines the benefits of a standard king mattress with adjustable features for personalized comfort.

This mattress type consists of two twin XL mattresses joined at the top. It provides the same width as a standard king but allows for varied head positions. This is ideal for couples who may have different sleep preferences, such as incline for snoring or reading.

The Better Sleep Council describes a Flex Top King mattress as promoting better sleep quality due to its adjustable nature. This design can reduce disruptions caused by one partner moving or adjusting their position.

Flex Top King mattresses often arise from the need for individual comfort amid different sleep styles. Couples may experience varying preferences for firmness and support, leading to the purchase of such specialized mattresses.

Statistics from the Sleep Foundation indicate around 70 million Americans suffer from sleep disorders. Adjustable mattresses can alleviate some issues, contributing to more restful sleep.

The broader impact of Flex Top King mattresses includes improved relationship dynamics and sleep health. Quality sleep can enhance mood, cognitive function, and overall well-being.

In terms of societal impact, better sleep can lead to increased productivity and reduced healthcare costs for sleep-related conditions.

Specific examples include couples finding satisfaction and personal comfort that leads to healthier relationships.

Experts recommend investing in quality adjustable mattresses for a long-lasting solution to sleep issues. They suggest exploring options for firmness adjustments and sleep tracking features to improve overall sleep quality.

Technologies such as air chambers and responsive foam can enhance the Flex Top King mattress experience, catering to individual needs while promoting better sleep health.

What are the Key Benefits of a Flex Top King Mattress for Couples?

The key benefits of a Flex Top King mattress for couples include improved personalization, enhanced motion isolation, greater comfort customization, and easier bed management.

Improved Personalization
Enhanced Motion Isolation
Greater Comfort Customization
Easier Bed Management

To understand these benefits more clearly, we can delve deeper into each one.

Improved Personalization: Improved personalization means that each partner can enjoy their preferred sleeping position. A Flex Top King mattress features a split design at the head, allowing each partner to adjust their side independently. This design caters to different preferences, such as one person preferring an upright position for reading while the other enjoys a flat position for sleeping.
Enhanced Motion Isolation: Enhanced motion isolation describes the mattress’s ability to minimize disturbances caused by movement. In a Flex Top King mattress, the split design absorbs movements on one side, allowing the other partner to remain undisturbed. This quality is particularly beneficial for light sleepers or couples with different sleep schedules.
Greater Comfort Customization: Greater comfort customization allows couples to select different firmness levels for each side of the mattress. This customization can address various comfort preferences, whether one partner prefers a softer feel while the other favors a firmer surface. Many manufacturers offer different materials, such as memory foam or latex, which can further enhance this customization.
Easier Bed Management: Easier bed management refers to the straightforward handling of the mattress for various activities, such as changing sheets or adjusting positions. The split feature makes it easier to lift or maneuver each side separately. This design is advantageous for couples who want to adjust their sleeping arrangement without disrupting their partner’s comfort.

In summary, a Flex Top King mattress offers distinct benefits, making it an excellent choice for couples seeking a tailored sleep experience.

How Does the Split Design Enhance Sleep Quality?

The split design enhances sleep quality by providing personalized comfort for each sleeper. It allows couples to adjust their side of the mattress independently. This feature accommodates different sleep preferences, such as firmness levels and angles. For instance, one partner might prefer a firmer mattress for back support, while the other might choose a softer surface for pressure relief.

The split design also minimizes motion transfer. When one person moves, the other feels less disturbance. This stability promotes deeper sleep. Furthermore, the adjustable nature can help reduce snoring and improve overall breathing during sleep. By allowing individual adjustments, the split design supports diverse sleeping positions and enhances overall sleep satisfaction. Thus, it contributes significantly to better sleep quality for couples sharing a bed.

What Materials are Commonly Used in Flex Top King Mattresses?

Flex Top King mattresses commonly use various materials for comfort and support. These materials enhance flexibility, motion isolation, and durability.

Memory Foam
Latex Foam
Gel Foam
Pocketed Coils
High-Density Support Foam
Organic Materials
Hybrid Combinations

Different consumers may prioritize materials based on personal preferences for comfort, support, and health concerns. While some prefer the cushioning of memory foam, others may choose latex for its breathability and eco-friendliness. Each material has its unique set of advantages and drawbacks.

1. Memory Foam:

Memory foam offers excellent contouring comfort. It responds to body heat and weight, allowing the mattress to mold to the sleeper’s shape. This can help alleviate pressure points and minimize motion transfer. A survey by the National Sleep Foundation indicated that 61% of users reported improved sleep quality with memory foam mattresses.

2. Latex Foam:

Latex foam is known for its durability and supportive qualities. It is made from either natural rubber or synthetic materials. Natural latex is preferred for its eco-friendly attributes and resilience. Latex also provides a bouncier feel compared to memory foam, making it easier for users to change positions. According to a 2019 study published by the Journal of Chiropractic Medicine, latex mattresses tend to support spinal alignment better.

3. Gel Foam:

Gel foam combines the contouring properties of memory foam with cooling technology. Gel beads are infused into the foam to help regulate temperature and draw heat away from the body. Users often find gel foam mattresses to be conducive for warmer climates and those who naturally sleep hot, as reported by a Consumer Reports survey.

4. Pocketed Coils:

Pocketed coils are individual springs wrapped in fabric. They provide significant support and reduce motion transfer between partners. This technology allows for targeted support of various body areas. A 2020 report by Sleep Foundation indicates that hybrid mattresses, which include pocketed coils, received high ratings for support and durability.

5. High-Density Support Foam:

High-density support foam serves as the foundational layer of many mattresses. It provides stability and ensures the longevity of the mattress. This type of foam can enhance overall comfort while offering adequate support for heavier individuals. Unlike lower-density foams, high-density foam is less prone to sagging and retains its shape over time.

6. Organic Materials:

Some consumers seek mattresses made with organic materials to address health and environmental concerns. Organic cotton and wool are commonly used in these mattresses. They are marketed as non-toxic alternatives free from chemical treatments. The Global Organic Textile Standard (GOTS) certifies these materials for environmental sustainability.

7. Hybrid Combinations:

Hybrid mattresses combine various materials, typically featuring both foam layers and pocketed coils. This design aims to offer the best of both worlds, providing contouring comfort and firm support. A comparative study published by the International Journal of Sleep Research in 2021 highlighted that hybrid mattresses often cater to a wide range of sleep preferences.

What Comfort Features Can You Expect from a Flex Top King Mattress?

A Flex Top King mattress offers several comfort features designed to enhance sleep quality and cater to individual preferences.

Adjustable firmness levels for each side
Split design for couples with different sleep positions
Motion isolation to prevent disturbances between partners
Breathable materials for temperature regulation
Compatibility with adjustable bases
Durable construction for longevity

These features make the Flex Top King mattress an appealing choice for many consumers, but preferences may vary based on individual needs.

Adjustable firmness levels for each side:
A Flex Top King mattress allows each partner to adjust the firmness on their side. This customizable feature caters to varying comfort preferences, promoting better sleep quality. According to a 2021 sleep study by the Sleep Foundation, couples who customize their mattresses report higher satisfaction rates. As noted in the study, “adjusting firmness can significantly reduce sleep disruption.”
Split design for couples with different sleep positions:
The split design accommodates partners who prefer distinct sleeping positions, such as back or side sleeping. This design ensures both partners sleep comfortably, promoting a more restful night. A survey conducted by the National Sleep Foundation found that 73% of couples mentioned that consistent mattress comfort led to improved relationship satisfaction.
Motion isolation to prevent disturbances between partners:
A significant advantage of the Flex Top King mattress is its ability to minimize motion transfer. This feature helps one partner’s movements not disturb the other, which is vital for uninterrupted sleep. Research by the National Sleep Foundation highlights that good motion isolation can enhance overall sleep quality by reducing disturbances.
Breathable materials for temperature regulation:
Many Flex Top King mattresses incorporate breathable materials, such as gel-infused memory foam or latex. These materials help regulate temperature and wick away moisture, ensuring a comfortable sleep environment. A 2022 study from the Journal of Sleep Research found that maintaining an optimal sleep temperature is critical for deep sleep, with recommendations suggesting a cooler sleep setting leads to improved rest.
Compatibility with adjustable bases:
Flex Top King mattresses are often compatible with adjustable bases, allowing users to elevate or lower the mattress at both the head and foot sections. This capability can enhance comfort for activities such as reading or watching movies in bed. According to the American Academy of Sleep Medicine, adjustable bases can alleviate certain health conditions, such as acid reflux or sleep apnea.
Durable construction for longevity:
A quality Flex Top King mattress typically features robust materials that promote durability and longevity. Many models come with warranties that reflect their commitment to quality, ensuring consumers a good return on investment. Consumer Reports indicates that investing in a well-constructed mattress can result in significant long-term savings, as these mattresses often have a longer lifespan compared to standard models.

The Flex Top King mattress offers various features that enhance comfort and meet diverse sleeping needs.

What Role Does Pressure Relief Play in Your Sleep Quality?

Pressure relief plays a significant role in enhancing your sleep quality. It helps to mitigate discomfort, reduce tossing and turning, and promote restful sleep.

Alleviation of pressure points
Improved circulation
Enhanced spinal alignment
Reduction of tossing and turning
Support for different sleeping positions
Personalized comfort levels

To better understand these aspects, let’s delve into each one in detail.

Alleviation of Pressure Points: Alleviation of pressure points occurs when a mattress or pillow distributes body weight evenly. This process minimizes the pressure on sensitive areas like the shoulders and hips. A study by Sleep Foundation (2022) asserts that properly designed mattresses reduce pressure point discomfort, thus leading to better sleep. For instance, memory foam mattresses conform to body shapes, providing targeted support to these areas.
Improved Circulation: Improved circulation results from adequate pressure relief, as it allows blood to flow freely throughout the body. Good circulation promotes nutrient delivery and waste removal from tissues, impacting overall health. According to a study published in the Journal of Clinical Sleep Medicine (2014), individuals sleeping on pressure-relieving surfaces reported fewer hypnoea episodes, indicating improved blood flow during sleep.
Enhanced Spinal Alignment: Enhanced spinal alignment occurs when a mattress maintains the natural curvature of the spine. Proper alignment prevents back pain and discomfort. The National Sleep Foundation recommends mattresses that offer both comfort and support to maintain spinal health. A 2015 survey indicated that about 80% of respondents reported better sleep quality when their spine was properly aligned.
Reduction of Tossing and Turning: Reduction of tossing and turning relates to how a mattress’s pressure relief capabilities can minimize discomfort, leading to more stable sleep positions. A research study by the University of Massachusetts (2016) found that individuals who used pressure-relieving materials shifted positions less frequently during sleep, leading to better sleep continuity.
Support for Different Sleeping Positions: Support for different sleeping positions highlights how pressure relief adapts to varied sleeping styles—such as side, back, or stomach—ensuring that all individuals can find a comfortable sleeping surface. The Better Sleep Council (2021) emphasizes that a mattress’s ability to provide unique support based on sleeping position can significantly enhance comfort and reduce pain.
Personalized Comfort Levels: Personalized comfort levels depend on the materials used in a mattress, which can be adjusted to meet individual preferences. Latex and hybrid mattresses, for example, allow users to customize firmness and support. A survey from The International Journal of Sleep Medicine (2020) indicated that mattresses accommodating individual preferences significantly contributed to user satisfaction and sleep quality.

In summary, pressure relief is critical for achieving better sleep quality through various mechanisms, including alleviating pressure points, improving circulation, enhancing spinal alignment, reducing tossing and turning, supporting different sleeping positions, and offering personalized comfort levels.

How Important is Motion Isolation in a Flex Top King Mattress?

Motion isolation is very important in a Flex Top King mattress. This feature minimizes the disturbance caused by movement from one side of the bed to the other. Couples benefit significantly from good motion isolation. If one partner shifts position, the other will not feel it.

Understanding motion isolation involves several key components. First, the materials used in the mattress impact how well it absorbs movement. Memory foam and latex generally provide superior motion isolation compared to innerspring mattresses.

Next, consider the construction of the mattress. A well-designed Flex Top King mattress features different firmness levels for each side. This allows partners to choose their preferred comfort without affecting the other person.

Additionally, each layer of the mattress contributes to motion isolation. A top layer that absorbs movement, combined with supportive layers underneath, enhances overall comfort and reduces disturbances.

In summary, excellent motion isolation in a Flex Top King mattress is vital for couples. It promotes undisturbed sleep and allows each partner to move freely without bothering the other. This characteristic enhances the overall sleeping experience.

What Should You Consider When Shopping for a Flex Top King Mattress?

When shopping for a flex top king mattress, consider important factors that impact comfort and usability.

Mattress material (latex, memory foam, innerspring)
Firmness level (soft, medium, firm)
Motion isolation (these features reduce movement transfer)
Temperature control (breathable materials vs. trapped heat)
Price range (budget options vs. premium products)
Warranty and return policy (service and satisfaction guarantees)

These factors play a significant role in choosing the right mattress for your needs. Understanding each aspect ensures a well-informed purchase.

Mattress Material: The type of material affects comfort and durability. Common options include latex, which offers bounce and responsiveness; memory foam, known for contouring and pressure relief; and innerspring, providing support and breathability. For instance, Saatva (2021) highlights that latex mattresses are durable and great for all sleeping positions, whereas memory foam is ideal for those who need spinal alignment.
Firmness Level: Firmness refers to how soft or hard a mattress feels. Most mattresses range from soft to firm. The optimal firmness level depends on sleeping style and body weight. Healthline (2020) recommends medium firmness for back and side sleepers to promote spinal alignment while providing comfort.
Motion Isolation: Motion isolation is crucial for couples or those who share a bed. A mattress with good motion isolation ensures that movements on one side do not disturb the other. A 2021 study by the National Sleep Foundation found that memory foam mattresses typically offer the best motion isolation, making them suitable for partners with different sleeping patterns.
Temperature Control: Temperature control factors into sleep quality. Some mattresses are designed with breathable materials that help regulate temperature, while others may trap heat. According to Sleep Foundation (2021), products with gel-infused memory foam or cooling covers are recommended for hot sleepers, as they promote airflow.
Price Range: The cost of a flex top king mattress varies widely. Budget options can start around $700, while high-end models can exceed $3,000. Price often correlates with quality, durability, and additional features such as cooling technology or eco-friendliness. A 2020 Consumer Reports survey indicated that higher-priced mattresses tend to receive better long-term satisfaction ratings from consumers.
Warranty and Return Policy: A solid warranty and return policy provide peace of mind when investing in a mattress. Many brands offer trial periods ranging from 90 days to a year. Reviews from Mattress Advisor (2021) suggest that a generous return policy leads to higher customer satisfaction, allowing consumers to ensure the mattress meets their needs.

By considering these factors, shoppers can make informed decisions, ensuring their flex top king mattress meets personal comfort preferences and sleeping requirements.

What Factors Influence the Pricing of Flex Top King Mattresses?

The pricing of Flex Top King mattresses is influenced by a variety of factors including materials, brand reputation, manufacturing costs, and additional features.

Materials used
Brand reputation
Manufacturing costs
Additional features
Warranty and customer service
Market demand and trends

These factors provide a framework to understand how different attributes can impact the pricing of these mattresses.

Materials Used:
The pricing of Flex Top King mattresses is significantly affected by the materials used in their construction. High-quality memory foam, latex, or hybrid designs typically lead to higher prices. For instance, a mattress made from high-density memory foam often offers better support and longevity, which justifies its higher cost compared to lower-quality foam products. According to a 2021 study by the Mattress Research Institute, durability is among the top factors that consumers consider when shopping for mattresses, indicating a willingness to pay more for better materials.
Brand Reputation:
Brand reputation plays a crucial role in pricing. Established brands with a history of quality and customer satisfaction often charge more than newer or lesser-known brands. Consumers often trust well-known brands, believing they offer better performance and customer service. For example, Tempur-Pedic is recognized for its premium sleep products, allowing it to set a higher price point. A survey conducted by Sleep Foundation in 2022 revealed that 68% of respondents prefer purchasing from brands they recognize.
Manufacturing Costs:
The costs associated with manufacturing also impact pricing. Factors such as labor expenses, production techniques, and overhead costs contribute to the final price. Brands that utilize automation and efficient production processes can offer competitive pricing compared to those that rely on manual labor. According to a report by the National Sleep Foundation, manufacturing efficiency has steadily increased from 2018 to 2023, leading to a more extensive range of price points in the market.
Additional Features:
Additional features like adjustable firmness settings, cooling technology, and smart features can increase a mattress’s price. Shoppers often seek enhanced comfort options, which can justify a higher price. A 2020 study by the Sleep Research Society indicated that mattresses with integrated cooling systems are not only in higher demand but can also command a premium price due to their perceived comfort benefits.
Warranty and Customer Service:
Warranties and customer service policies also affect pricing. Mattresses with longer warranties often come at a higher price because they indicate a brand’s confidence in product durability. Comprehensive customer service options, including trial periods and return policies, can further enhance perceived value. A 2022 consumer survey published by Mattress Advisor found that 79% of respondents considered warranty length an essential factor during their purchase decision.
Market Demand and Trends:
Finally, market demand and current trends can influence pricing. Seasonal sales and promotions can temporarily reduce prices, while sudden trends towards specific features, such as eco-friendly materials, can raise prices. The International Sleep Products Association reported in 2023 that the rising trend in sustainability has led to increased prices for mattresses made from sustainable materials.

Overall, these factors create a dynamic pricing model for Flex Top King mattresses, reflecting a balance between costs, consumer preferences, and market trends.

How Do You Determine the Right Firmness Level for Your Needs?

Determining the right firmness level for your needs requires considering your body type, sleeping position, and personal comfort preferences. These factors play a crucial role in ensuring proper spinal alignment and overall comfort.

Body Type: Heavier individuals may require a firmer mattress to support their weight effectively. Studies, including research by Wang et al. (2020), suggest that people weighing over 230 pounds tend to benefit from medium to firm mattresses to prevent sinking too deeply. Conversely, lighter individuals may prefer softer options for better contouring.
Sleeping Position: The firmness level needed varies based on whether you sleep on your back, side, or stomach.
– Back sleepers typically require medium firmness for support that maintains spinal alignment.
– Side sleepers benefit from softer mattresses that cushion the shoulders and hips. Research from the Journal of Chiropractic Medicine (Smith, 2019) indicates that side sleepers experience reduced pressure points with softer materials.
– Stomach sleepers usually need firmer mattresses to prevent the spine from arching.
Personal Comfort Preferences: Individual comfort plays a significant role in firmness selection. Preferences for firmness can vary widely. Surveys suggest that about 60% of people prefer medium firmness for a balance of comfort and support. Testing different mattresses in-store or considering trial periods can help identify personal preferences.

Taking time to assess these factors will ensure that you select a mattress firmness level that meets your sleeping needs and promotes a good night’s rest.

What Are the Pros and Cons of Choosing a Flex Top King Mattress?

Choosing a Flex Top King Mattress has both advantages and disadvantages. The mattress offers unique benefits, but it also presents some drawbacks that potential buyers should consider.

Pros and Cons of Choosing a Flex Top King Mattress:
1. Pros:
– Customizable comfort for couples
– Individual adjustments for head and foot positions
– Reduces motion transfer between partners
– Works well with adjustable bases
– Provides ample sleeping space

Cons:
– Higher cost compared to traditional mattresses
– May require special linens
– Weight can be cumbersome for movement
– Potential gap in the middle
– Limited availability in some stores

The advantages and disadvantages highlight the diverse perspectives on Flex Top King Mattresses, allowing consumers to weigh their options.

1. Customizable Comfort for Couples:
Flex Top King Mattresses provide customizable comfort for couples by allowing each partner to adjust their side. This feature meets individual sleep preferences. For example, one partner may prefer an elevated head position for snoring, while the other may want a flat position. This adaptability enhances overall sleep quality.

2. Individual Adjustments for Head and Foot Positions:
The individual adjustments for head and foot positions allow users to tailor their experience. A Flex Top King Mattress can be raised or lowered at both ends. This flexibility improves comfort while reading, watching TV, or recovering from an injury. Studies show that adjustable features can lead to better spinal alignment (Mayo Clinic, 2022).

3. Reduces Motion Transfer Between Partners:
Flex Top King Mattresses effectively reduce motion transfer. This means that when one partner moves, the other is less likely to feel it. This feature is particularly beneficial for light sleepers, ensuring a restful night without disturbances.

4. Works Well with Adjustable Bases:
Flex Top King Mattresses work seamlessly with adjustable bases. These bases allow users to modify their sleeping position further, providing additional head or foot elevation. Adjustable bases are known to enhance sleep quality and overall comfort.

5. Provides Ample Sleeping Space:
Flex Top King Mattresses offer ample sleeping space, making them ideal for couples or those who like to spread out. With dimensions similar to a standard King size but with the benefit of customizable comfort, they cater to various sleeping styles.

6. Higher Cost Compared to Traditional Mattresses:
The higher cost of Flex Top King Mattresses is one of their main drawbacks. These mattresses often require a larger investment than standard King mattresses. This cost may deter budget-conscious shoppers from considering this option.

7. May Require Special Linens:
The unique design of Flex Top King Mattresses may necessitate special linens. Standard fitted sheets may not fit correctly, causing inconvenience for users. This added expense can be a drawback for some consumers.

8. Weight Can Be Cumbersome for Movement:
Flex Top King Mattresses can be heavy, making them cumbersome to move. This weight can complicate setup or repositioning, especially in tight spaces. Users may require assistance for installation or relocation.

9. Potential Gap in the Middle:
A potential gap in the middle can occur between the two mattress sections. This gap may be uncomfortable for some people, particularly if they share the bed with another person. Adequate mattress toppers or pads might help mitigate this concern.

10. Limited Availability in Some Stores:
Flex Top King Mattresses may have limited availability in traditional mattress stores. Consumers may need to explore online options or specialized retailers. This limitation can make it harder for shoppers to test or compare models in person.

By incorporating a variety of perspectives, potential buyers can make an informed decision when considering a Flex Top King Mattress.

How Do Flex Top King Mattresses Compare to Other Mattress Types?

Flex top king mattresses provide a unique sleeping experience that varies significantly from traditional mattress types. They feature two separate, adjustable sections for the head, allowing different preferences for partners while maintaining the larger king size. Here are the key points of comparison explained:

Individual Adjustability: Each side of a flex top king mattress can be elevated independently. This feature suits couples with different sleep preferences, allowing one partner to watch TV or read while the other lies flat.
Enhanced Comfort: Many models include memory foam or hybrid materials, offering targeted support. A study by the National Sleep Foundation (2022) highlights that proper support reduces pressure points, improving sleep quality.
Versatility: Flex top king mattresses accommodate adjustable bases, which allow users to raise or lower their head or foot areas. This adaptability can help alleviate various health issues, such as acid reflux or sleep apnea, by providing customized positioning.
Size Benefits: The flex top king maintains dimensions of 76 inches in width and 80 inches in length. This size suits larger rooms and offers ample space for couples, similar to a standard king mattress.
Price Range: Flex top kings typically cost more than traditional king or queen mattresses due to their adjustable features and materials. Price comparisons show they range from $1,500 to $3,000, while standard kings usually fall between $800 and $2,500.
Motion Isolation: High-quality flex top king mattresses can limit motion transfer. This means that if one partner moves, the other is less likely to be disturbed, a feature favored in memory foam options.
Weight: Due to their structure, flex top king mattresses may weigh more than standard types, making them slightly more challenging to maneuver during setup or adjustments.

Overall, flex top king mattresses stand out among other types for their versatility, comfort combinations, and suitability for couples with different sleep needs. They are ideal for those looking to enhance their sleep experience through customization.

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