KURUKURU Co., Ltd. (Headquarters: GINZA SIX 13F, 6-10-1 Ginza, Chuo-ku, Tokyo; Representative Director: Yasuhiro Sekizawa), the Japanese bedding brand "GOKUMIN," has launched a new color, "Light Gray," for its waterproof mattress protector, "Waterproof Protector," which protects mattresses from dirt and moisture. This new color, designed to blend into bedrooms, became available on July 2, 2026. (Available in 2 colors, including the existing black, and 3 sizes).

"Mattresses cannot be washed, yet they are exposed to sweat and moisture daily." "Even if dirt and odors are a concern, they cannot be easily replaced." — Focusing on these hygiene issues with mattresses, this product features a special two-layer structure with a TPU waterproof membrane laminated to the back of the fabric, achieving "waterproof yet breathable." It combines waterproof performance with a water resistance of 6,000mm and high moisture permeability, along with features like antibacterial and deodorizing treatment and 0% dust mite penetration (anti-mite test by a third-party testing organization), all condensed into a single sheet like a fitted sheet to keep your daily sleep clean.

Developer's Thoughts and Background

Bedding is a household item that is in contact with the skin for the longest duration each day. However, while pillowcases and sheets can be washed frequently, the base mattress cannot be washed. Mold, dust mites, dust, night sweats, children's nocturnal enuresis, pet hair, and home care — mattresses get dirty more easily than imagined, and once stains soak in, they cannot be removed, shortening the lifespan of your valuable bedding.

"Waterproofing makes it stuffy." "Preventing stuffiness lets water through." Many protectors have compromised on these conflicting challenges. GOKUMIN pursues a single product that achieves both breathability and waterproofing without compromise.

Even if it costs a little more, placing a "good sheet" made with attention to function and materials over your mattress. Just doing that will make your daily sleep cleaner and allow you to continue using your irreplaceable mattress for a long time. We wanted to deliver this waterproof protector as a "smart move to protect all your bedding." And now, "Light Gray," a new color that gently enhances the bedroom, is added to the lineup, which was previously only available in black.

"Waterproof Protector" with New "Light Gray" Color (2 Colors Total / 3 Sizes Total)

【Waterproof yet Breathable, Comfort That Lasts All Year Round】

On sweaty nights, stuffiness in bedding can lead to shallow sleep. GOKUMIN's waterproof protector releases moisture that tends to build up during sleep to the outside with its excellent moisture permeability and high breathability. The comfortable, waterproof yet breathable feel lasts all year round, making it less noticeable even in humid summers or with night sweats in winter, supporting a dry and comfortable sleep until morning regardless of the season.

【Special Two-Layer Structure x 6,000mm Water Resistance Protects Bedding from Moisture】

The TPU waterproof membrane, laminated with a polyurethane film on the back of the fabric, provides waterproof performance with a water resistance of 6,000mm. It's a special two-layer structure that repels water while allowing moisture in the form of vapor to escape, achieving both breathability and waterproofing. With a gusset design that accommodates mattress thicknesses from 5cm to 35cm, it fits a wide range of mattresses. The all-around elastic and anti-slip features ensure smooth attachment and removal. It can be put on like a fitted sheet. *The side gusset is not waterproof, and moisture may penetrate depending on usage.

【0% Dust Mite Penetration & Antibacterial/Deodorizing for a Clean Sleep Environment】

Anti-mite tests by a third-party testing organization confirmed 0% dust mite penetration. It is treated with antibacterial and deodorizing agents, leading to a clean sleep environment that can be used at any time. The surface has a dry-touch finish that doesn't feel sticky when wet, with a crisp texture. Different fabrics are used for the top and sides, with a breathable mesh on the sides for a design that dries easily.

【Easy Care with Machine Washability in a Laundry Net. Comes in a Luxury Gift Box】

It can be machine washed on a gentle cycle using a laundry net, making it easy to care for, especially since it's used daily. It comes in a luxury gift box, making it suitable for gifts, and includes a one-year quality warranty. It will continue to cleanly protect your and your family's daily sleep.

Product Information | GOKUMIN Waterproof Protector Light Gray

[Color] Light Gray (Existing color: Black, making a total of 2 colors)

[Price] Single ¥9,098 / Semi-double ¥10,098 / Double ¥11,498 (All prices include tax) *

(*Product prices are subject to change.)

[Size] Single: Approx. 97×195cm / Semi-double: Approx. 120×195cm / Double: Approx. 140×195cm (Compatible mattress thickness: Approx. 5-35cm)

[Product Weight] Single: Approx. 1.2kg / Semi-double: Approx. 1.3kg / Double: Approx. 1.4kg

[Material] Top fabric: 100% Polyester / Side fabric: 100% Polyester / Back: TPU film laminate (waterproof treatment)

[Specifications] Water resistance 6,000mm (breathable waterproof) / Antibacterial and deodorizing treatment / Anti-mite test 0% dust mite penetration (tested by a third-party testing organization) / All-around elastic and anti-slip features / Machine washable on gentle cycle with laundry net / Instruction manual included / Luxury gift box included *Dryer and drum-type washing machines cannot be used *Side gussets are not waterproof

[Release Date] July 2, 2026 (Thu)

[Retailers]

Official EC: https://gokumin.co.jp/products/t-sh01s?variant=53571153297715

Amazon: https://www.amazon.co.jp/dp/B0H6PSH7L5

Yahoo! Shopping: https://store.shopping.yahoo.co.jp/shuterlife/t-sh01s.html

Rakuten Ichiba: https://item.rakuten.co.jp/gokumin/t-sh01/

au PAY: https://wowma.jp/item/713824641

Qoo10: https://www.qoo10.jp/g/1155064021

Cumulative Series Sales: 2 Million Units "What is GOKUMIN"

Because sleeping is the beginning of a happy day.

"GOKUMIN," a Japanese bedding brand, offers high-quality bedding at affordable prices. Thanks to your support, we have received numerous awards, including the "Amazon.co.jp Seller Award 2023" and have achieved top rankings in the bedding brand category for two consecutive years. We are highly regarded by many people. To realize healthy and prosperous daily lives as advocated by SDGs, we will continue to pursue products that can be said to be "the right choice."

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● [GOKUMIN] Renewal and Launch of 3 Main Mattress Series on May 12th & 13th | New Lineup Selectable by 3 Axes: "Customized," "Hotel-Grade," and "Pressure Distribution"

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● Sleep Survey] Approximately 46% "Not Satisfied" with Cooling Bedding, Approximately 97% "Want to Use" Air Conditioner Compatible Bedding | 350 Respondents Show New Concept of "Blanket for Sleeping with Air Conditioner"

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GOKUMIN Official SNS

Instagram: https://www.instagram.com/gokumin_official/ X: https://x.com/gokumin888 LINE: https://s.lmes.jp/landing-qr/2004248957-drqYJvzN?uLand=7KYQLJ

Company Profile

KURUKURU Co., Ltd.

"People Create. For People, We Create." A company that creates and delivers with heart.

Company Name: KURUKURU Co., Ltd. Representative Director: Yasuhiro Sekizawa Location: GINZA SIX 13F, 6-10-1 Ginza, Chuo-ku, Tokyo 104-0061 Established: September 2015 Capital: 50 million yen Official HP: https://www.kurukuru.co.jp/

FACT BOX

  • Source: PR TIMES
  • Category: New Product
  • Organizations: GOKUMIN