Although unused, the item has been opened once. Thank you for your understanding. Mattress Cover Warm Sheet, Also for Futon, Approx. 30cm Depth, Housecover (Double, 140X200cm, Gray) 【Warm Contact Temperature & Heat Retention Function】This winter box sheet uses high-density premium flannel fabric. The densely packed microfiber traps a lot of air in the pile, firmly trapping warm air and providing excellent heat retention. The moment you get into bed, you'll be enveloped in a fluffy, warm embrace. It's an essential item for the chilly autumn and winter seasons. 【Melting-like Texture】The length and fineness of the pile determine the feel. Housecover winter box sheets use 220g/㎡ high-density, ultra-fine flannel material. The fine fibers are densely packed, making it fluffy and soft, and once you touch it, you'll be hooked. 【CICA Moisturizing Ingredient Coating】CICA (Centella Asiatica extract), a hot topic in the cosmetics industry, is also used in the sheet fabric. It reduces static electricity and makes it difficult for dust and pollen to cling. It lasts longer than conventional anti-static chemical treatments with natural moisturizing ingredients. It also enhances the softness of the fabric and helps moisturize the skin and prevent skin irritation. 【Easy to Attach/Detach, All-Around Elastic】The box type with elastic all around fits perfectly on mattresses with a thickness of 3-28cm. It is less likely to slip and wrinkle, making bed making smooth every morning. It completely covers the corners of the mattress. 【Washable & Anti-Static】You can wash it at home, so you can always use it clean. When using a washing machine, be sure to use a laundry net. It is processed to suppress the generation of static electricity, reducing stress in the winter. It also suppresses the attraction of dust due to static electricity. 【Quality & Oeko-Tex Standard】Our box sheets are planned and designed in Japan and manufactured in factories certified by the Oeko-Tex Standard 100, a certification system that guarantees that textile products meet high safety and environmental standards. Delivers safe and healthy sleep for those with sensitive skin. 【Specifications】Box sheet size: Double, 140X200 x 30cm depth. Material: Ultra-fine flannel fabric (CICA moisturizing treatment + photocatalytic antibacterial treatment). With elastic all around, easy to attach/detach, fits perfectly on mattresses/futons with a thickness of 3-28cm.