A double bed sheet is a type of bedding that is designed to fit on a double-sized mattress. A double bed sheet typically measures between 43 and 68 centimetres wide and 224 and 274 centimetres long. A normal single bed sheet is 30 and 40 inches wide by 66 and 86 inches long. The extra width and length on a double bed sheet allow it to fit snuggly over the entire mattress. This will help keep your sheets in place and prevent them from slipping off the bed. A double bed sheet is popularly sold in standard sizes and can be found on most websites that sell bedding. They are available in both synthetic and natural fibres, such as cotton, polyester, and more.