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Float. Relax. Release.
The ultimate mattress
Passed
30-Year
Durability Test
PRESSURE DISTRIBUTION
COMFORTABLE
IMPROVE BLOOD FLOW
TURN OVER SUPPORT
BREATHABLE
BED TEMPRATURE CONTROL
MITE AND MOLD PREVENTION
WASHABLE
SUSTAINABLE MATERIALS
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?
When comparing fatigue recovery after seven hours of sleep on the BRAIN SLEEP mattress versus a typical functional mattress, results showed that the BRAIN SLEEP mattress delivered a 14% higher fatigue recovery rate.
When comparing fatigue recovery after seven hours of sleep on the BRAIN SLEEP mattress versus a typical functional mattress, results showed that the BRAIN SLEEP mattress delivered a 14% higher fatigue recovery rate.
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?
Flagship model
Pursues exceptional comfort by minimizing and evenly dispersing the physical pressure placed on the body during sleep, delivering ultimate sleep through the combination of "ideal sleep posture" and "advanced pressure dispersion".
When the body is released in a weightless environment, the shoulders naturally settle inward and the legs rise slightly.
This posture is considered one of the least physically demanding positions for the human body.
Through its proprietary three-dimensional structure, the mattress creates a buoyant, floating-like rebound and adjusts firmness to the shoulders, lower back, and legs, guiding the body into ultimate relaxation—free from gravity.
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.
Countless fibers form a three-dimensional hybrid rebound structure, providing multidirectional support rather than support in a single plane.
This structure responds optimally to variations in body weight and surface area across different zones.
In addition, the proprietary nine-layer construction absorbs gravitational force and converts it into rebound energy—firmly supporting the body while helping maintain proper sleep 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.
By maintaining proper sleeping posture, the mattress enables smooth, effortless turning during sleep.
Its nine-layer structure repeatedly absorbs and rebounds in sync with body movement, supporting each turn throughout the night.
By minimizing energy expenditure during sleep, it reduces physical strain and helps maintain comfort until morning.
A proprietary three-dimensional fiber structure delivers exceptional breathability.
Every turn during sleep releases built-up heat and humidity.
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.
Conventional mattresses cannot be washed, and trapped moisture can lead to the growth of mold and dust mites.
As a result, frequent replacement is often unavoidable.
The BRAIN SLEEP Mattress is not only washable—its material itself resists moisture buildup, making it difficult for dust mites to thrive.
This allows the mattress to remain clean and hygienic overtime.
The cover can be removed and machine-washed, and the mattress itself is also fully washable.
The mattress can be rinsed clean in the shower, then simply air-dried in the shade—making maintenance easy and straightforward.
Typical urethane or coil mattresses tend to trap heat and moisture due to poor breathability, creating an environment where dust mites and mold are more likely to grow.
In contrast, the BRAIN SLEEP Mattress features excellent airflow, making it less prone to dust mites and mold. When house dust or dirt becomes a concern, the mattress can be washed at any time, helping maintain a consistently clean and hygienic sleep environment.
Everyday use makes durability a key concern when choosing a mattress.
This product has demonstrated high durability through compression testing at three times the JIS standard of 80,000 cycles.
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.
This photo shows the double size. Other sizes are also available.
Single: approx. W100 × L196 × H20 cm (Leg section: 24 cm)
Semi-Double: approx. W120 × L196 × H20 cm (Leg section: 24 cm)
Double: approx. W140 × L196 × H20 cm (Leg section: 24 cm)
Queen: approx. W160 × L196 × H20 cm (Leg section: 24 cm)
Graduated firmness at the shoulder area
Topper sheet: 100% Cotton (Filling: 80% Polyester, 20% rayon)
Base cover: 100% Polyester
Mattress: 100% Polyethylene
The mattress core is made from 100% recyclable materials, designed with consideration for the environment.
Crafted from 100% cotton fabric with excellent moisture absorption and release.
Highly breathable, it offers a smooth, gentle touch that softly envelops the body for a comfortable night’s sleep.
Features a side zipper for easy removal and care.
Flagship model
PREMIUM FLOAT
A premium model offering
the highest level of sleep comfort,
with a 20 / 24 cm profile
The flagship of the Float series, featuring a nine-layer structure that maintains an ultimate relaxation posture and delivers durability designed to last up to 30 years. A bed mattress that further reduces strain on the body.
PLUS FLOAT
A standard model that provides firm support with a thickness of 15 / 19 cm
With a 7-layer construction, the mattress firmly supports the body while promoting a relaxed sleeping posture and smooth turning during sleep, helping maintain comfortable rest throughout the night.
Designed for long-term use of up to approximately 10 years, this model is recommended for those using the Float series for the first time.
FLOAT
A compact model with a 5 / 9 cm profile, designed to achieve ultimate relaxation.
The three-layer structure firmly supports the body while promoting fatigue recovery.
Resistant to the influence of bedding or floor surfaces underneath, it can be placed on an existing mattress, futon, flooring, or tatami—adapting easily to a wide range of sleep environments.
Its foldable design allows for compact storage when not in use.
Have questions about the product?
The development team will answer your inquiries directly. Please feel contact us.
The MATTRESS FLOAT is designed with a firm base surface that minimizes the influence of what lies beneath it.
Whether placed on an existing mattress or futon, or used directly on flooring or tatami, this mattress adapts seamlessly to a wide range of sleep environments.
With sufficient rebound and support, it delivers comfortable sleep even when used on its own.
Its versatility also makes it a practical option as a futon-style mattress, convenient for temporary use or accommodating overnight guests.
White
A mattress sheet for easy replacement and washing
Compatible mattress
BRAIN SLEEP MATTRESS PREMIUM FLOAT
*This sheet is not compatible with the “BRAIN SLEEP Mattress The Premium” sold prior to 2022, as the shape and closure specifications (zipper type) differ.
The topper sheet can be used when purchased together with the base cover.
Available for purchase [here].
Materials: 100% Cotton (Filling: 80% Polyester, 20% rayon)
洗い替え用に便利なマットレスシーツです。
A mattress sheet for easy replacement and washing
Compatible mattress
BRAIN SLEEP MATTRESS PREMIUM FLOAT
*This sheet is not compatible with the “BRAIN SLEEP Mattress The Premium” sold prior to 2022, as the shape and closure specifications (zipper type) differ.
The topper sheet can be used when purchased together with the base cover.
Available for purchase [here].
Materials: 100% Cotton (Filling: 80% Polyester, 20% rayon)
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: 80% Polyester, 20% rayon)
Base cover: 100% Polyester
6-Layered Base: 100% Polyethylene
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: 80% Polyester, 20% rayon)
Base cover: 100% Polyester
6-Layered Base: 100% Polyethylene
The product is delivered in three separate packages.
▼Single Size
①Approx. 103 × 69.5 × 48 cm ②Approx. 104 × 69 × 23 cm ③Approx. 62 × 42 × 31 cm
▼Semi-Double Size
①Approx. 123 × 69.5 × 48 cm ②Approx. 124 × 69 × 23 cm ③Approx. 62 × 42 × 31 cm
▼Double Size
①Approx. 143 × 69.5 × 48 cm ②Approx. 144 × 69 × 23 cm ③Approx. 62 × 42 × 31 cm
▼Queen Size
①Approx. 164 × 69.5 × 48 cm ②Approx. 164 × 69 × 23 cm ③Approx. 62 × 42 × 31 cm
Yes. The topper sheet and base cover can be removed and machine-washed.
When using a washing machine, please place them in a laundry net and use a machine with a capacity of 8 kg or more.
Do not use a tumble dryer.
You can rinse the mattress core with water in the shower.
After washing, let it air-dry in a flat, well-ventilated area, out of direct sunlight.
If odors or stains are a concern, we recommend using a mild, diluted neutral detergent.
No. Futon dryers or electric blankets cannot be used.
Also avoid placing the mattress near heaters or other heating appliances, as heat may damage the materials.
No additional sheet is required, as the topper sheet included in the set is easy to attach and remove, and can be machine-washed.
Yes.
We recommend the mattress sheets (box-sheet type) available from the BRAIN SLEEP store, but standard box sheets sold on the market can also be used.
When using a box sheet, please place it over the topper sheet.
For details, please refer to the comparison chart.
By adding an extra layer to your current Float Mattress, you can upgrade it to the Premium model.
The upgrade set is available for purchase here.
同じファイバー系高反発マットレスとして圧倒的な知名度を持つ某商品とかなり迷いましたが、脚元が少し高くなる独自の傾斜設計と、寝室に馴染む洗練された見た目が決め手となり「ブレインスリープ マットレス プレミアム フロート」を購入しました。まだ使い始めて間もないので、評価はできませんが、反発具合もちょうどよく寝心地もよいので買ってよかったと思います。
マットレスにお金をかけるかかけないか、すごく迷っている時に、人生の1/3という言葉で決心しました！
購入して、女の私でも1人でパッと組み立てられました！
寝心地も快適で、わんちゃんが1番に寝ていました笑
お金をかける価値あります。
良い寝心地です
しっかりとしていて寝心地が良い。寝やすくなりました。
何度も体験して納得して買ってよかった^_^
大満足です
マットレスフロートよりも寝心地が良いです。
寝心地最高です👍
まだ使い始めたばかりですが、とても寝やすくて良いです
夏は涼しくて快適、冬が少し心配
元々枕を使用していて、価格が高かったので悩んでいたが、色々なレビュー動画を見て購入を決めました。
以下実際感じた事です。
・実際の使用感は、思っていたより硬めです。
・通気性が高く空気が篭る感じはないです。
・シャワーで手軽に洗えるので清潔。
・寝返りが今まで使った中で一番しやすい。
設置に関しては、別途マットレス回収のプランを付けましたが、作業していただいた人(会社)によると思いますが、設置マニュアルが無いのかわからないがマットレスの組み立てが違うんじゃないかと指摘して、自分と作業員さんとでインターネットで検索して組み立てた。
本当に簡易的な図面しか付いていないので、
価格的にもここはしっかりした設置マニュアルを付属してほしいと感じた。
毎日快適に使わせていただいています。
思ったより固い寝心地で、そんなに沈み込みはありません。自分たちには合っています。組み立てやすさもよかったです。
｢価格が高いから、有名人がレビューしていたから良いものである｣という幻想は、実際に数ヶ月使ってみて見事に打ち砕かれました。
私はある方の案件動画を視聴し、こちらの製品に興味を持ちました。
その動画内ではひどく絶賛されており、また他の方のレビュー動画を見ても概ね似たような反応だったので購入を決意。
しかし、実際に使用してみると想像と全く違っていました。
｢浮く、巡る、軽くなる｣という謳い文句とは裏腹に、心は沈んでいきました。私はこんなもののために大枚をはたいたのかと後悔しました。
主な後悔は以下の通りです。
まず、寝心地が硬いこと。浮くような感触は一切ありません。
次に、横向き寝と相性が悪いこと。アピールポイントである足を上げる構造は、横向き寝とは非常に相性が悪い。逆に不自然な姿勢になります。販促の映像で、横向き寝をしていたので問題ないと思っていましたが誤りだったようです。
最後に価格。購入前は覚悟の上でしたが、実際に寝てみて唖然としました。価格だけの価値があるとはとても思えなかった。
私がこれだけの後悔をした責は、私の調査不足にあります。生活リズムが不安定になりがちな職業である、配信者やゲーマーに多く案件を出していた時点で気づくべきでした。
これから購入を検討される方は今一度よく考えてほしいです。そして出来るなら実際にマットレスを試してください。そうして探したほうがより自分に合ったものを選べると思います。
間違っても思考放棄しないでください。
｢レビューが高評価だから｣｢有名人がオススメしていたから｣などといった曖昧な理由で製品を選んでしまっては、私のように後悔する可能性が高まります。必ず自分の頭で考えて、出来るなら自分の体で試して選ぶようにしてください。
体重が重い私でもしっかりと反発を感じることができ、いままでにない寝心地で期待以上だった。
高い買い物だがその分満足度も高い。
高反発を求めている人におすすめ。
足側が高くなっているのもよい
寝返りしやすい、体が痛くならないマットレスです。
当初固めに感じだが慣れれば心地良いです。
寝心地が良く、途中で目が覚めるようなことがなくなりました。
毎日快眠です。
夜中目が覚めることが、少なくなりました！！
足のところが少しあがっているのも、ポイントだと思います。
使い始めて１週間ですが明らかに毎朝の目覚めが軽くなった。買って正解でした。
めちゃくちゃ良かったです！
同じくような素材の他社マットレスよりも格段に良いです。
買って正解！
布団に入るのが気持ち良すぎてやばいです
部屋を改修したのを機に思い切って購入しました。
設置して少し寝転ってそのまま爆睡ｗ
夜寝るのが楽しみになってます。
最高です
横になると寝落ちしてしまう。目覚めた時はスッキリ感が凄いです。
硬めのマットレス。腰がしっかりサポートされ、寝汗もかかない、目覚めたときにすっきり起きられる気がします。寝返りがうちやすい。
高反発のマットレスで寝心地はとてもいいです。変な力が入らずリラックスして寝れるようになりました。
今まで電気毛布を使用していたため、今の寒い時期はなんとなく寒い気がします。冬の使用は工夫が必要になります。
ただ、洗えるので衛生面は安心です。
すごくいいマットレスです
CAMPAIGN
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Adjust your neck to the ideal curve while you sleep
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Medical device
Full recovery just by wearing it to sleep
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Get the best sleep anywhere with this one product
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Ideal sleeping posture and ultra-dispersion of body pressure
A mattress that changes your wake-up
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