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Washing Instructions
It can be washed in a home washing machine. Please put it in a laundry net and wash it with water. Since it is a dark color, please wash it separately from white and light colored items. Also, please avoid using bleach (chlorine-based or oxygen-based).
Washing and drying
Do not tumble dry and hang dry in the shade out of direct sunlight.
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Ranked No.1 in the summer bedding category
on the crowdfunding platform Makuake,
drawing on the technologies developed through the PERFECT COOL series
Designed for comfort through prolonged midsummer heat
An innovative
cooling sleepwear
is introduced!
In 2023, Japan recorded its highest average temperature on record.
As nights in Japan grow increasingly subtropical,
sleepwear emerges as a practical solution.
Sleepwear that brings comfort to
nights of relentless heat.
Sizes:
S / M / L / XL
Colors:
Black / Medium gray
Instant contact cooling upon wearing, combined with moisture-absorbing cooling that activates during sleep, supports comfort throughout the night.
The core of the yarn is made from cooling nylon, surrounded by polyethylene with even higher cooling performance, resulting in an ultra-fine yarn composed of approximately 100 filaments.
This ultra-fine yarn is then woven together with nylon and polyurethane yarns using a proprietary knitting technique.
Dual cooling technology: Contact cooling
Cooling performance: 260%
A proprietary cooling fiber is used, achieving a contact cooling value of 0.524, the highest level, for exceptional cooling performance.
*Contact cooling (Q-max: W/cm2)
Based on a reference value of 0.2, the cooling performance is approximately 260%.
Dual cooling technology: Moisture-absorbing cooling
A specialized material absorbs humidity and perspiration generated during sleep, lowering temperature as moisture is taken in.
Effective cooling performance continues through the night, with cooling functionality confirmed even after 50 wash cycles.
In the test, participants wore the sleepwear, and a mist was applied to simulate perspiration.
Surface temperature was then measured using thermography, resulting in a temperature of 26.3°C, which corresponds to the ideal in-bed sleeping environment.
(Mist application: 60 sprays, approximately 6.5 g of water)
This innovative technology delivers cooling while reducing clamminess, helping maintain comfort during sleep.
In testing, when the moisture-absorbing component was immersed in water on the right side, a decrease in water temperature was confirmed.
Easy to wash at home, with reliable antibacterial and deodorizing performance that helps maintain cleanliness day after day.
The fabric is treated with antibacterial and deodorizing processing to help prevent bacterial growth during the summer months.
Delivering 2.5 times the antibacterial deodorizing standard (antibacterial activity value: 2.2), with effectiveness maintained even after 10 wash cycles.
The side that touches the skin is smooth, reducing friction while incorporating a cooling fabric with moisture-diffusion properties.
The outer layer uses 100% cotton with high moisture absorbency, offering a gentle feel on the skin and an efficient design that disperses humidity.
During summer sleep, perspiration is said to exceed 500 ml, yet this highly moisture-diffusive fabric supports a comfortable sleeping environment.
By combining materials with high moisture absorbency and moisture-diffusion performance, humidity—one of the primary causes of sleep disruption—is efficiently absorbed and released.
This helps regulate moisture levels effectively, supporting continued comfort even when perspiration occurs.
Designed with a relaxed fit, including elasticated areas that minimize pressure on the body.
This allows for ease and relaxation without interfering with natural movement during sleep.
Designed to support comfort during pre-sleep relaxation and to avoid interfering with natural movement during sleep.
Larger armholes are incorporated, and excessive pressure from elastic or ribbing is minimized, helping maintain a comfortable range of motion and reduce stress throughout the night.
By reinforcing the neckline, the design helps prevent deformation and stretching, maintaining a clean, well-defined neckline.
The T-shirt hem features a gentle curve, with side slits on both sides to add a light, airy feel.
The dual-layer fabric construction reduces transparency even when worn on its own and helps minimize visible perspiration marks.
This allows for easy wear and a design suitable for brief outings as well.
When mist was applied to the inner side to simulate perspiration, no visible staining appeared on the outer surface.
Available in two colors: Black and Medium Gray
A unisex size designed to fit all genders, ages, and body types.
Outer fabric: Cotton 100%
Inner fabric: Blended fibers (Polyethylene / Nylon) 46% / Nylon 44% / Polyurethane 10%
Made with a luxurious polyester twill fabric.
The packaging features a unified beige tone with matching ribbon, and the Brain Sleep logo is placed with a refined, elegant sizing.
The wide, lavish ribbon creates a premium, sophisticated feel that is perfectly suited for gifting.
The most comfortable
summer sleep
Yes. This product is machine washable.
Please place it in a laundry net and wash with water. As the fabric is a dark color, wash separately from white or light-colored items. Avoid using bleach (both chlorine- and oxygen-based).
No. Please avoid tumble drying. Hang to dry in a shaded area, avoiding direct sunlight.
Ironing is not recommended, as high temperatures may cause fabric damage.
The side that comes into contact with the skin features a dual-layer structure made with highly absorbent and moisture-diffusing materials, making sweat stains less noticeable.
Black and charcoal Gray.
This product comes in a unisex size with a relaxed fit. Please refer to the size guide on the product page to select your preferred size.
This wear is designed primarily for warmer seasons. With its cooling functionality and short-sleeve top and half pants design, it is ideal for summer and hot, humid nights.
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
The ultimate cooling sensation lasts all night long
Summer quilt
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