About this product: 【Size Information】Semi-double: 120 x 200 x 30cm / Color: Navy. It completely covers both futons and mattresses. (Sheets only, pillowcases are not included. *No waterproof function.) 【Microfiber Fabric】: By densely weaving ultra-fine fibers, it combines "warmth" and a "smooth, silky feel" that you'll want to keep touching. It has a heat-generating mechanism; the ultra-fine fibers absorb moisture from the skin and convert it into warm air, which is then returned to the skin. 【Static Electricity Reduction】: It has an anti-static effect to reduce that annoying static electricity that often occurs in the dry winter. It is resistant to shedding, contains no fluorescent agents, and maintains a soft, comfortable feel. 【Sheets that can be easily attached in 30 seconds!】: Excellent 3D stretch in both vertical and horizontal directions, allowing for easy attachment in just 30 seconds with three steps: ① Cover the corners, ② Stretch it out, and ③ Release. "Stretches and fits!" Easy to attach and detach! 【For replacements】: We recommend purchasing two or more for replacements. Machine washable, so you can always keep it clean. Washing instructions: 1. Tumble drying prohibited; 2. Do not use bleach; 3. Do not iron. (*We recommend using a laundry net.)