Launching the 'Pat-Sheet 5-Sided Waterproof Box Sheet': Balancing Waterproofing with Bedroom-Friendly Design

Launching the '5-Sided Waterproof Box Sheet' that Balances Waterproofing with Bedroom-Friendly Design

405 Co. Ltd. (HQ: Yokohama) will launch its new '5-Sided Waterproof Box Sheet' on June 5, 2026, on Rakuten Ichiba, as part of the 'Pat-Sheet' series. The product combines a simple look that blends into bedrooms with waterproof functions to protect mattresses.

While designed to be fitted to a bed like a normal box sheet, this box-type bedding features a waterproof specification covering both the top and sides of the mattress.

It was planned for those who want to protect hard-to-wash mattresses from daily moisture issues such as night sweat, spills, life with children or pets, and home care.

Product Page: https://item.rakuten.co.jp/shop405/5sheets/ *Sales start scheduled for 10:00 AM on June 5, 2026.

### Development Background Although mattresses are daily-use bedding, it is difficult to wash them, and managing them when stains or moisture problems occur is cumbersome. On the other hand, conventional waterproof sheets carry strong impressions of being for childcare or nursing, which made them feel difficult to use for those who prioritize the atmosphere of the bedroom or the appearance of normal box sheets.

Therefore, 405 Co. Ltd. planned the '5-Sided Waterproof Box Sheet' that balances an appearance that fits the bedroom with functionality that protects the mattress.

### Product Features 1. Waterproof bedding with a box sheet feel It can be fitted to a bed like a normal box sheet and used as daily bedding that does not spoil the bedroom atmosphere.

2. 5-sided waterproofing protects top and sides Designed to cover the top and four sides of the mattress, it helps protect against dirt on the mattress body by covering areas where moisture is likely to transmit.

3. Easy to attach and detach Designed to be easily attached and detached to the mattress with an all-around elastic specification.

4. Easy-to-use specifications for daily life Uses polyester for the top fabric and features quilted padding for a comfortable feel. It is machine washable.

5. Available in various sizes and colors Available in Single, Semi-double, Double, Queen, and King sizes, supporting mattress thicknesses of approximately 5cm to 25cm. Colors are Gray and White.

### Sales Overview Product Name: Pat-Sheet 5-Sided Waterproof Box Sheet Release Date: June 5, 2026 (Fri) Price: From 2,980 yen Sales Channel: Rakuten Ichiba