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Ideal sleeping posture and ultra-dispersion of body pressure
A mattress that changes your wake-up
BRAIN SLEEP MATTRESS FLOAT
BRAIN SLEEP MATTRESS FLOAT
¥88,000
Regular price
Sale price
¥88,000
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per
Tax included.
送料無料
132 in stock
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【対象エリア限定】マットレスの組み立て・設置 有料サービス+
おすすめアイテム
ブレインスリープ コンフォーター パーフェクト ウォーム EX
これ1枚でOK 羽毛も毛布もいらない、究極に暖かい掛布団
¥49,500
ブレインスリープ マットレスプロテクター パーフェクト ウォーム EX
背中の保温性112％UP
マットレスを、冬仕様にアップグレード ¥14,300
マットレスを、冬仕様にアップグレード ¥14,300
Materials +
Polyethylene
Size +
Product size (cm) mattress only
Approx. 195 × 100 × 5 cm (leg section: 9 cm)
Approx. 195 × 120 × 5 cm (leg section: 9 cm)
Approx. 195 × 140 × 5 cm (leg section: 9 cm)
Package Dimensions (Including Packaging)
Approx. 104 × 23 × 69.5 cm
FBA package size: approx. 112.5 × 23 × 69.5 cm
Approx. 124 × 23 × 69.5 cm
FBA package size: approx. 123.5 × 23 × 69.5 cm
Approx. 144 × 23 × 69.5 cm
FBA package size: approx. 152.5 × 23 × 69.5 cm
Product weight kg (Mattress Only)
Approx. 5.9 kg
Approx. 6.9 kg
Approx. 8.0 kg
Product Weight (Including Packaging)
Approx. 7.8 kg
Approx. 9.3 kg
Approx. 10.7 kg
Approx. 195 × 100 × 5 cm (leg section: 9 cm)
Approx. 195 × 120 × 5 cm (leg section: 9 cm)
Approx. 195 × 140 × 5 cm (leg section: 9 cm)
Package Dimensions (Including Packaging)
Approx. 104 × 23 × 69.5 cm
FBA package size: approx. 112.5 × 23 × 69.5 cm
Approx. 124 × 23 × 69.5 cm
FBA package size: approx. 123.5 × 23 × 69.5 cm
Approx. 144 × 23 × 69.5 cm
FBA package size: approx. 152.5 × 23 × 69.5 cm
Product weight kg (Mattress Only)
Approx. 5.9 kg
Approx. 6.9 kg
Approx. 8.0 kg
Product Weight (Including Packaging)
Approx. 7.8 kg
Approx. 9.3 kg
Approx. 10.7 kg
Country of manufacture +
JAPAN
Warranty +
Warranty card and instruction manual included
Warranty period: 1 year
Warranty period: 1 year
Proteger Extended Warranty +
The extended warranty must be purchased at the same time as the product.
We cannot accept orders for the warranty alone.
It is different from the service that comes with the product.
×
Posture × core body temperature control For a lighter body feel tomorrow.
Sleep is not just about time.
It’s about quality
The only mattress that brings together the full science of The Stanford Method for Ultimate Sound Sleep.
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?
What matters in a mattress comes down to
two aspects of body control.
two aspects of body control.
Posture×core body temperature
The ultimate relaxed posture
Designed to recreate the posture identified
by NASA as placing minimal strain on the body
by NASA as placing minimal strain on the body
Designed for the ultimate relaxed posture
FLOAT
TECHNOLOGY
TECHNOLOGY
Patent No. 7727279
A proprietary float structure
that supports the legs,
waist, and shoulders
This structure enables a neutral sleeping posture and effective body pressure distribution,
helping reduce physical strain during sleep.
that supports the legs,
waist, and shoulders
This structure enables a neutral sleeping posture and effective body pressure distribution,
helping reduce physical strain during sleep.
Advanced pressure distribution
A three-layer structure supports the body from multiple directions,
facilitating smooth movement during sleep.
A foldable two-way design allows for compact storage.
facilitating smooth movement during sleep.
A foldable two-way design allows for compact storage.
In addition,
Lowering core body temperature
for deeper “golden 90 minutes”
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.
Drawbacks of a typical mattress
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
Common issues caused
by an ill-fitting mattress
by an ill-fitting mattress
- Waking up still feeling tired, even after a full night’s sleep
- Feeling fatigued from the moment the day begins
- An uncomfortably warm and humid sleep environment
- Lower back pain and shoulder stiffness
- Waking up during the night
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?
One change can transform sleep
TECHNOLOGY
01Float technology
Recreating the neutral posture identified by NASA
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.
A deeply relaxed posture supported
through the legs, lower back, and shoulders
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
View detailed evidence
Relaxation of the body and mind
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.
A sleep posture that minimizes physical strain
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.
Superior pressure distribution and high resilience
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.
Elevating the legs supports circulation and recovery
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.
View detailed evidence
Blood circulation increases by approximately 150%
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.
Supports smooth turning during sleep
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.
Zoned support tailored to different body areas helps maintain an ideal sleeping posture
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.
02Super breathable
Controls temperature and humidity for optimal sleep through super-breathable materials
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.
View detailed evidence
Lower surface temperature rise compared to other materials
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.
High level of heat dissipation
prevents heat from accumulating
The BRAIN SLEEP mattress features a highly breathable material that retains significantly less heat than other materials, inducing high-quality sleep throughout the night.
03CLEAN FOR LONG TIME
& DURABILITY
Washable with water for lasting cleanliness
Mites and household dust are less likely to accumulate
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.
View detailed evidence
Minimal mold growth
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.
Outstanding durability, equivalent to 80,000 uses
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.
MADE IN JAPAN
Meticulous craftsmanship,
trusted quality
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.
Natural spring water with minimal impurities is used to prevent quality degradation
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.
SCENES
Use it on your existing bedding—or on its own
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.
SPECSpecifications
Size
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)
Shoulder rest
gradation
Graduated firmness at the shoulder area
Color
Material
Cover: 100% polyester
Inner material: 100% polyurethane
A 100% recyclable, sustainable material
The mattress core is made from 100% recyclable materials, designed with consideration for the environment.
Sheets for BRAIN SLEEP MATTRESS FLOAT
Custom-fit organic cotton sheet
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
Comparison table
A mattress designed to redefine how your morning begins, with ideal sleep posture and advanced pressure dispersion.
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.
Purchase now
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
Purchase now
FAQFrequently asked questions
How long does the mattress last?
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.
Recommended replacement timing
If you begin to notice sagging, reduced resilience, or significant soiling, we recommend considering replacement.
Delivery size and packaging
[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
Can I use futon dryers or electric blankets with this mattress?
Futon dryers or electric blankets are not recommended.
Please also avoid using the mattress near heating appliances such as space heaters.
商品レビュー
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BRAIN SLEEP MATTRESS PLUS FLOAT
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ブレインスリープ コンフォーター パーフェクト ウォーム EX
ブレインスリープ史上最高 羽毛を超越した極暖掛け布団
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ブレインスリープ マットレスプロテクター パーフェクト ウォーム EX
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