Bedsheets are a type of cloth or fabric that is used to cover a mattress for sleeping. They are typically made of cotton, linen, or a blend of synthetic fibers, and come in various sizes to fit different bed dimensions, such as twin, queen, king, and California king. Bedsheets are available in different thread counts, which refer to the number of threads woven into a square inch of fabric, and generally range from 200 to 1000. Higher thread counts are often associated with softer and more luxurious sheets. Bedsheets may also come in a variety of colors, patterns, and designs to match any bedroom decor. They are usually sold as sets, which typically include a fitted sheet that hugs the mattress, a flat sheet that lies on top of the fitted sheet, and one or two pillowcases to cover pillows.