【Size】Fits mattresses of 140cm x 200cm and 5-30cm thickness! Box type with anti-slip rubber all around. 【Material】Flannel (100% polyester) 【Smooth, skin-friendly feel】The box sheet is densely packed with microfiber, preventing warmth from escaping. 【Fluffy and warm】The soft and gentle touch soothes and warms both body and mind. The natural feel is stress-free and comfortable to use. 【Moisture-absorbing and heat-generating】The box sheet generates heat through the adsorption heat produced when the moisture-absorbing and heat-generating microfiber absorbs moisture. It's an essential bedding cover for people who feel cold easily to spend winter comfortably. 【High insulation, prevents warmth from escaping】The moisture-absorbing and heat-generating microfiber layer of the bed sheet traps heat and moisture between the fibers, creating an air layer that maintains the appropriate humidity on the sheet surface, providing long-lasting heat retention. 【Static electricity suppression】The bed cover is treated with [anti-static] processing to reduce the generation of crackling static electricity indoors during winter. The moisture absorption of flannel also helps to reduce static electricity by trapping moisture between the fibers. 【Washable】The box sheet can be washed in your home washing machine, so you can always use it cleanly. It also dries quickly, which is convenient for washing in the cold season. ※Color: Gray ※Compressed ※Double size