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BRAIN SLEEP’s warmest comforter to date
An exceptionally
warm comforter
that goes
beyond down
Featuring an industry-first patented material "Carbon Nano Down"
An ideal in-bed temperature
that feels warm and comfortable
even in extreme cold environments of
31.3
is maintained
Simply by using COMFORTER PERFECT WARM EX
even in environments
as cold as −14°C
Inside the comforter
the temperature is kept comfortable.
Compared with premium down comforters, it delivers 196% higher warmth performance while also supporting an ideal in-bed environment.
A major update to the functions of
the previous PERFECT WARM EX
with an even softer, lighter feel
that goes beyond down
Infused with BRAIN SLEEP’s expertise
and proprietary patented technologies
A one-of-a-kind ultimate comforter is introduced
The secret lies in revolutionary
carbon
technology
developedBRAIN SLEEP
CARBON TECHNOLOGY
The filling uses a proprietary, patented material, Carbon Nano Down.
A special carbon treatment is applied to the fibers, enabling warmth, comfort, and cleanliness in a single advanced filling.
Its large, interlocking particle structure traps warm air effectively,
maximizing heat retention.
A next-generation filling developed in Japan.
*Based on bedding filling materials available in Japan as of September 2025.
Heat retention
Moisture absorption and heat generation
Moisture absorption and release
Low lint shedding
Far-infrared radiant heat
Antibacterial
Mite-resistant
Deodorizing
Washable
Resilient recovery
*Based on bedding filling materials available in Japan as of September 2025.
A proprietary, next-generation filling
A multifunctional hybrid
particle filling
Carbon Nano Down
Patent No. 7734358
Using advanced technology,
it delivers exceptional heat retention,
while also supporting comfort and cleanliness.
A carbon treatment is applied to the reverse side of the ultra-lightweight fabric.
This treatment prevents heat from escaping the comforter,
shielding the inside from cold external air.
Thermal insulation
A proprietary, next-generation filling
A multifunctional hybrid
particle filling
Carbon Nano Down
Patent No. 7734358
Using advanced technology,
it delivers exceptional heat retention,
while also supporting comfort and cleanliness.
More than warmth,
comfort and cleanliness
that go beyond down
| Down | PERFECT WARM EX | |
| Heat retention | ○ | ◎ |
| Heat generation | × | ◎ |
| Radiant heat | × | ◎ |
| Resistance to dampness | × | ◎ |
| Cleanliness | × | ◎ |
| Odor resistance | × | ◎ |
| Fit | △ | ◎ |
| Washability | × | ◎ |
| Resilience | ○ | ◎ |
| Dust release | High | Low |
| Ease of storage | △ | ◎ |
| Maintenance | Down | Carbon Nano Down |
Compared with premium goose down comforters containing 93% down, it achieves approximately 196% higher heat retention.
Under assumed winter conditions, using PERFECT WARM EX raises the in-bed temperature by 6.6°C within 20 minutes,
achieving an ideal in-bed temperature of approximately 33.0°C
Compared with premium goose down comforters among down products,
it achieves approximately 196% higher warmth performance.
The shoulder and foot areas, where heat is most likely to escape, are filled with additional Carbon Nano Down to help block out cold external air during sleep.
POWER UP
POWER UP
Through a special carbon treatment applied to both the outer fabric and the filling, it delivers ultimate warmth.
Carbon is processed at an ultra-fine, nano-scale level and specially integrated into fibers.
These fibers are then formed into particles, creating Carbon Nano Down.
Carbon Nano Down features large, interlocking particles.
This structure helps retain warm air effectively, delivering exceptional warmth.
A carbon treatment is applied to the reverse side of the ultra-lightweight fabric.
This thermal insulation technology helps prevent internal warmth from escaping
while shutting out cold air from outside.
The proprietary brushed fabric on the skin side combines exceptional softness, breathability, and moisture-absorbing heat generation, delivering comforting warmth from the very first moment you slip inside.
POWER UP
POWER UP
Crafted with a special fiber structure refined to closely resemble cashmere, the fabric achieves a softness and smoothness reminiscent of true cashmere.
POWER UP
POWER UP
Cashmere and wool feature a unique fiber structure with scale-like layers that open and close to help regulate moisture.
This structure was recreated from the ground up. As a result, a sleep environment is created that remains warm while maintaining high moisture absorption and release, reducing clamminess.
Moisture is further converted into heat, enhancing heat generation performance.
Shifting that can occur when layering a comforter and blanket is eliminated.
The integrated design allows for use as is, without a cover.
A 3D twin quilt construction is used to maximize the performance of Carbon Nano Down.
The double-layer quilting prevents fill from shifting and reduces heat loss through the seams.
The result is a close, body-hugging fit.
Compared with down comforters, breathability is significantly improved.
Moisture is absorbed and released across the entire comforter, helping maintain a dry, comfortable sleep environment.
The entire comforter can be washed, with a clean finish.
Suitable for washing in a household washing machine.
[Recommended washing machine capacity]
• Single / Semi-double size: washing machines with a capacity of 9 kg or more
• Double / Queen size: washing machines with a capacity of 11 kg or more
※Requirements may vary depending on the washing machine model and design.
※Always refer to the manufacturer’s instruction manual.
※Please place the comforter in a laundry net designed for comforters before washing.
※If washing in a household machine is not possible, use a large-capacity coin-operated laundry machine
or a professional comforter cleaning service.
Carbon Nano Down used in the filling offers powerful antibacterial and deodorizing properties, suppressing the growth of bacteria, neutralizing unpleasant perspiration odors,
and helping prevent the proliferation of dust mites.
With minimal fiber release, it can be used comfortably and with confidence every day
Proper storage is an essential part of bedding care.
Stored in the included dedicated bag, the comforter remains compact
and takes up minimal space.
Unlike traditional down comforters, this comforter can be stored in compression bags, making space-saving storage even easier.
Down comforters are typically not suitable for compression, as feathers may damage the outer fabric and leak out.
Single: W150 cm × L210 cm (approx. 2,890 g)
Semi-Double: W170 cm × L210 cm (approx. 3,230 g)
Double: W190 cm × L210 cm (approx. 3,570 g)
Queen: W210 cm × L210 cm (approx. 3,940 g)
Stone Gray
・Outer fabric:
Front: 100% polyester
Back (pile): 100% polyester
Base fabric: 55% polyester, 45% rayon
・Insulation:
85% polyester, 15% acrylic
Yes. It can be washed at home.
Please place the comforter in a laundry net and wash it separately.
Avoid using bleach, including chlorine-based or oxygen-based bleach.
Yes, it can be washed at home.
Please place the product in a laundry net and wash it separately. (Using a BRAIN SLEEP laundry net designed for comforters.)
As a guideline for washing machine capacity: ingle / Semi-double sizes: washing machines with a capacity of 9 kg or more
Double / Queen sizes: washing machines with a capacity of 11 kg or more
Depending on the shape or model of the washing machine, the product may not fit.
In such cases, hand washing or using a large-capacity coin laundry or a professional bedding cleaning service is recommended.
Avoid forcing the product into the washing machine, as this may cause damage to the machine.
Please check your washing machine’s instruction manual before washing.
To prevent discoloration or fading, please avoid using bleach
(both chlorine-based and oxygen-based).
Tumble drying may cause shrinkage or damage to the product, so please avoid using a tumble dryer.
Yes, a futon dryer can be used.
However, please avoid using a it directly on top of a BRAIN SLEEP mattress or near a BRAIN SLEEP pillow, as heat may alter the shape of the product.
Choose a day with low humidity and good ventilation for washing.
Wash early in the day and hang to dry, alternating both sides to ensure even drying.
When drying, gently pat the product by hand to loosen the filling and restore its fluffiness.
This product is designed to be used as is, without a comforter cover.
If you prefer to use a cover, standard-size comforter covers available on the market can be used for all sizes.
Yes, compression storage bags can be used
Please ensure the product is thoroughly washed and completely dried before placing it in a compression storage bag.
When using the product again, remove it from the bag and spread it out to allow air to enter the comforter before use.
The product is available in one color only: Stone gray
The comforter has an approximate thickness of 10 cm, offering a fluffy, voluminous feel.
Please use the blanket side directly against the skin.
The material is treated with an anti-static finish.
However, depending on environmental conditions such as low humidity, static electricity may still occur.
If this happens, we recommend adjusting the bedroom humidity using an air conditioner or humidifier, washing the product once, or lightly misting it with water.
No animal fibers are used.
This is an animal-free comforter.
As a result, it does not have animal-related odors. However, depending on humidity and storage conditions, the material itself may develop an odor.
In such cases, we recommend deodorizing and air-drying the product or washing it once.
BRAIN SLEEP COMFORTER comparison chart
No down comforter.
No blanket.
A fitted mattress protector designed for use with mattresses.
A fitted mattress protector designed for use with mattresses.
When used together, it increases heat retention around the back by 112%, while effectively blocking cold air rising from below.
Cold air in winter tends to accumulate near floors and ground surfaces,
and that chill can travel upward through the mattress.
This mattress protector helps shield the body from that cold,
supporting a warmer, more comfortable sleep environment.
Just place it over an existing mattress or mattress pad to create an exceptionally warm, non-clammy sleep environment.
The protector uses Carbon Heat EX for the insulation and the same fabric as Blanket EX.
Compatible mattress height:
Designed for mattresses approximately 20–30 cm thick.
It can also be used with thinner mattresses; however, excess fabric on the underside may occur, so please tuck it in securely during use.
Using the comforter and mattress protector together, above and below, enhances overall warmth.
・Single: W100 cm × L205 cm (approx. 1,140 g)
・Semi-double: W120 cm × L205 cm (approx. 1,300 g)
・Double: W140 cm × L205 cm (approx. 1,470 g)
Stone gray
・Outer fabric,br>Pile section: 100% polyester,br>Base fabric: 55% polyester, 45% rayon,br>Lining: 100% polyester,br>Pile backing fabric: 94% polyester, 6% polyurethane,br>・Insulation,br>43% plant-based fiber (kapok),br>30% polyester,br>20% acrylic
This winter,
experience ultimate warmth
with a single layer
今回２回目の購入です。それまで羽毛を使ってましたが、暖かさはこちらの方が体に沿うので暖かく感じますし、おうちで洗濯機で洗えるのでクリーニング代もかかりません。こんなに薄くてすごく暖かく、羽毛よりも汗ばないような気がします。本当に買ってよかったと思います。
旧型？も持っていますが、そちらは重くて持ち運びが大変、、(暖かさはバッチリなのですが)
その点、このタイプは全体的な大きさ厚さはあるものの、とっても軽いです！ふんわりぬくぬくです。
これ一枚でかなり温かい。
洗濯機で丸洗いしても傷まないのでとても楽。
あたたかいです！体があたたまります。
春になって買ったけど、もう少し早く買えばよかった。
来年の冬が楽しみです。
適度な重さで密着感があって良いです。
とてもあたたかいです。
気持ち良すぎて起きれない
カバーなしで使用してますが肌触り気持ちいいです。
これ１枚で冬すごせそうです,
あったかい
生地、重さ共にかなり軽めで非常に使いやすい。
暖かさもしっかりあるので良いと思います
暖かいです！
部屋は寒くても布団の中はあったかい。洗濯機で洗えるのも嬉しい。
北関東在住なので雪国に比べたら寒くない地域ですが、これ一枚では寒くて眠れません。毛布2枚追加して寝ています。
一枚だけで暖かい、というところに惹かれて買ったので、残念です。
軽くて寒い中で使ってもすぐ温まってきます、、
肌に当たる部分のふかふか素材は本当に気持ちいいし、布団の外側にある防寒機能はとても良いです！
ただし、これ1枚で完璧に寒くないというのは私的には難しく、寒冷地住まいも合間って羽毛布団の代わりにしつつ使ってます。自分の体に触れている部分は暖かいのですが、少し足をずらすとひやっとしてしまうのは寒がりな私には少し物足りなく…。
でも埃も出にくく、メンテナンスも自宅で可能。重ねがけしても重くなりすぎず、真冬じゃなければ快適な掛け布団なので、これから大切に長く使っていきます！
あたたか～い
-14度でも暖かいと言うことで購入しました。2025年12月26日寝室の温度が12度くらいだったのですがあまり暖かく無く(温度にムラがある感じ）前に使っていた羽毛布団（厚）に変えました。暖かくて快適に眠れるかと思ったのですが残念です。
古くなった羽毛布団を手放そうと春からコンフォーター オールシーズンズを使っていましたが12月に入って少し肌寒いと感じていたので買ってみました。朝目覚めた時、暖かい～羽毛布団より良いかも！と思いました。買って良かったです！他の色が出ると更にいいなーと思います。
軽くて暖かくて、サイズもたっぷりしてて足もはみ出さない。
買って良かったです！
予想以上に軽くとても暖かい！羽毛布団よりいい！
配信で紹介されてるのを見て、今使っている羽毛布団の重さが気になっていたので思い切って購入してみました。
なめらかな手触りが心地よく、なんといってもこの薄さとは思えないくらい温かいです。
さすがに冬はこれ一枚では耐えられないので他の毛布などを重ねていますが、それでも十分すぎるほど温かいし、ボリュームが抑えられるので見た目もすっきりして寝室が少しおしゃれになった気がします。
軽さがとにかく気に入りました。特に、羽毛布団はカバーのせいで重さが増えていたので、カバーなしで使っても問題ない仕様が大変ありがたかったです。
羽毛布団より軽くて薄いのに暖かくて、見た目も触り心地も良いです。
しかも洗える。満足してます。
肌触り良く、あったかく…
とても寝心地が良いです
思い切って購入して良かったです。
1枚で、暑すぎず快適に寝られます。肌触りもよく、買って満足の商品でした。
暖かくてさわり心地もふわふわでとても気持ちいいです。毛布なしでいいので軽くて寝返りしやすいのもいいです
12月始まってすぐの寒波、なのにこの1枚でぬくぬくでした！
とても暖かいです！そして軽い♪
毛布よりも肌触りが良くて時間とともに暖かくなるので最高です。
買ってよかった
お客用にシングルサイズで探していて、寒い冬はこれがいいと思い購入しました。旧タイプとは仕様が変わっていて、より軽く、暖かそうで母も喜んでいます。購入して良かったです。
ハウスダスト対策に買いました。あたたかいですし、洗えるのが嬉しいです。ただ、カバーがある方がもっと気楽にあらえるので、市販のものでも使えるようにループがついてれいれば助かりました。
思ったよりも軽くてとても暖かいです
因幡はねるさんのファンでブレインスリープさんを知り、ピローを購入し、今回コンフォーターパーフェクトウォームEXダブルを購入しました。
丁度良い暖かさで気持ちよく使わせて頂いています。
残念なのが10日待てば一万円以上の割引があったのでカバーも買うことができたのですが…残念。
寝やすい
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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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