Recreating the neutral body posture proposed by NASA
Guiding the body toward ultimate relaxation

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.

Elevating the legs enhances circulation and supports recovery from fatigue

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.

A new sensation of resilience
Reduces physical strain through a nine-layer hybrid rebound structure

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.

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.

Ultra pressure dispersion supports natural turning, helping the body rest with less energy

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.

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.

Washable with water for lasting cleanliness
Helps reduce dust mites and house dust

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.

Exceptional durability equivalent to 30 years of use

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.

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.

Shoulder rest
gradation

Graduated firmness at the shoulder area

Exclusively designed 100% cotton sheet

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.

Comparison table

Use it on your existing bedding, or place it directly on the floor

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.

Topper Sheet

White / Navy

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 outer fabric: 100% cotton (filling: 100% polyester)

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 outer fabric: 100% cotton (filling: 100% polyester)

For those who own the Float Mattress

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

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