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Posture × core body temperature control For a lighter body feel tomorrow.
We spend nearly a third of our lives asleep.
When sleep quality is poor, the brain and body do not fully rest, making it difficult to perform at their natural best.
Because sleep products are part of our everyday lives, why not reconsider sleep from the perspective of quality?
In addition,
Sleep quality is largely influenced by the depth reached during the first 90 minutes after falling asleep.
When this “golden 90 minutes” remains shallow, longer sleep alone does not necessarily improve quality.
This BRAIN SLEEP mattress, designed with breathability in mind, helps lower core body temperature, guiding sleep toward greater depth.
Difficult falling asleep due to heat buildup in the mattress
Excessive sinking can place strain on the body
Too soft / too firm
Restricted turning during sleep
Difficult to care for (not washable, moisture tends to build up)
Dust mites and mold can develop
It is said that sleep is said to makes up
one-third of our lives.
Why not take a fresh look at the mattress —
one of the most important elements of quality sleep?
Astronauts have noted that resting in space feels more comfortable than on Earth.
When the body is freed from gravity, the shoulders naturally settle inward and the legs rise slightly—forming a posture considered to place minimal strain on the body.
Float technology recreates this neutral posture. Through its unique three-dimensional structure, it provides balanced support tailored to the shoulders, lower back, and legs, creating a floating sensation while maintaining optimal firmness.
This design encourages a deeply relaxed posture, easing the body away from gravitational load.
Leg float
Elevates the legs
to support circulation in the body
Lumber support
Three layers of high-resilience fiber
provide stable lumbar support
Shoulder rest
Supports a posture
that allows easier breathing
This product creates a posture that supports deeper, more comfortable breathing.
By shifting brain activity toward an alpha-wave–dominant state, it helps guide both the body and mind into a relaxed state.
Mattresses made from soft materials such as urethane may feel comfortable due to their plushness, but in practice, excessive sink depth can place strain on the body during sleep.
By using a high-resilience material, this product minimizes sink depth and supports a sleep posture close to a neutral position—often described as the ideal posture for deep relaxation.
The material used in this product features a three-dimensional structure formed by interwoven, tube-shaped elements with high resilience.
By adapting to the contours of the body, countless coil-like structures provide support from multiple directions, allowing pressure to be distributed evenly across the surface.
The leg section is designed to sit 4 cm higher than the chest, encouraging smoother blood flow back toward the upper body. This positioning helps ease feelings of fatigue and swelling.
In a comparison between a flat mattress and this product, which features an elevated leg-rest structure, blood flow volume increased by approximately 1.5 times.
This increase is believed to help alleviate fatigue and swelling.
The lumbar area, which bears the greatest pressure, is designed with a higher-density structure to provide stable support throughout sleep.
By reducing excessive sinking at the lower back, the design allows for smoother turning during sleep, offering comfort even for those who are mindful of lumbar support.
A wire-shaped support core, “Wire Wave,” features fibers of varying thickness designed to correspond to different areas of the body, supporting the body from within the mattress.
By accommodating differences in body pressure across each zone, it prevents excessive sinking and helps maintain an ideal sleeping posture.
To achieve quality sleep, maintaining proper temperature and humidity within the sleep environment is essential.
With over 90% of its structure composed of air layers, heat and moisture generated during sleep do not build up, creating a consistently comfortable sleeping environment.
Sleep quality is largely influenced by the depth reached during the first 90 minutes after falling asleep. Lowering core body temperature supports deeper sleep, while heat buildup prevents body temperature from dropping, making it harder to fall asleep.
With its highly breathable structure, the BRAIN SLEEP mattress shows a lower rise in surface temperature compared to other materials, contributing a smoother transition into sleep.
The BRAIN SLEEP mattress features a highly breathable material that retains significantly less heat than other materials, inducing high-quality sleep throughout the night.
Shower-washable for easy cleaning—simply rinse with water and allow to dry in a well-ventilated area. Maintenance is simple and hassle-free.
Mattresses made of urethane foam or coils tend to trap heat and moisture due to limited breathability, creating an environment where dust mites and mold are more likely to grow.
In contrast, the BRAIN SLEEP mattress features excellent breathability, making it difficult for dust mites and mold to develop, as well as being washable with water to help maintain a consistently clean sleeping environment.
Compared to other materials, this product shows a significantly lower level of mold growth.
It is also recommended for those sensitive to house dust or allergies, as well as for families who sleep with young children.
Everyday use makes durability a key concern when choosing a mattress.
This product has demonstrated high durability through compression testing equivalent to 80,000 cycles, in accordance with JIS standards.
Even with long-term use, it continues to deliver stable comfort.
*Durability may vary depending on usage conditions.
Each mattress and pillow is carefully crafted, with skilled technicians and artisans conducting repeated quality checks by hand.
After passing rigorous inspections, each item is meticulously packaged and delivered with care.
The production process uses natural spring water from Shimizu Bakuen, designated as one of Toyonokuni’s 15 Famous Waters—a special soft water with exceptionally low levels of impurities.
By using such pure water, unnecessary chemical reactions are avoided, helping to prevent any deterioration in quality.
The Float Mattress is designed with a firmer base layer where it meets the bed or floor, ensuring stable comfort regardless of how or where it is placed.
It can be placed on top of an existing mattress or futon, or used directly on flooring or tatami—adapting naturally to a wide range of living spaces.
With ample resilience, the mattress provides comfortable support even when used on its own, making it suitable both for everyday use and for accommodating overnight guests.
Single: approx. W100 × L196 × H5 cm (Leg section: 9 cm)
Semi-Double: approx. W120 × L196 × H5 cm (Leg section: 9 cm)
Double: approx. W140 × L196 × H5 cm (Leg section: 9 cm)
Queen: approx. W160 × L196 × H5 cm (Leg section: 9 cm)
Graduated firmness at the shoulder area
Cover: 100% polyester
Inner material: 100% polyurethane
The mattress core is made from 100% recyclable materials, designed with consideration for the environment.
Crafted from 100% organic cotton grown on farmland cultivated for over three years without the use of pesticides or chemical fertilizers, this sheet combines environmentally responsible natural materials with functional technology designed for everyday cleanliness.
Developed specifically for the Mattress Float, it delivers a balance of comfort, hygiene, and refined usability.
Antibacterial & deodorizing / Quick-dry & moisture-absorbing
The standard model of the Float series, offering exceptional breathability, washable-by-shower practicality, and a design that guides the body into an ultimate state of relaxation.
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This set is designed for customers who already own the Float Mattress, enhancing it into a more premium setup.
*This set cannot be used on its own without the Float Mattress.
Materials
Topper sheet: 100% Cotton (Filling: 100% Polyester)
Base cover: 100% Polyester
6-Layered Base: 100% Polyethylene
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Like general bedding products, it is designed for long-term use.
The mattress offers excellent resilience and durability. In addition to the JIS-standard durability test of 80,000 compression cycles, it has also been tested at double (160,000 cycles) and triple (240,000 cycles) the standard. Even at three times the standard, it maintains over 96% performance, demonstrating outstanding durability.
If you begin to notice sagging, reduced resilience, or significant soiling, we recommend considering replacement.
[BRAIN SLEEP Mattress Float]
<Single>
Height 69 cm × Width 104 cm × Depth 23 cm
<Semi-Double>
Height 69 cm × Width 124 cm × Depth 23 cm
<Double>
Height 69 cm × Width 144 cm × Depth 23 cm
<Queen>
Height 69 cm × Width 164 cm × Depth 23 cm
Futon dryers or electric blankets are not recommended.
Please also avoid using the mattress near heating appliances such as space heaters.
Supports side sleeping
Pillow for correcting sleeping posture
For nights when snoring or a dry mouth is a concern
A moisturizing throat spray to keep your throat moist
Medical device
Full recovery just by wearing it to sleep
CAMPAIGN
20％OFF
The ultimate cooling sensation lasts all night long
Summer quilt
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