Twin size sheets are bedding designed to fit a twin bed, which typically measures 38 inches wide by 75 inches long. These sheets come in various materials, including cotton, polyester, and blends, providing options for comfort and durability. A standard twin sheet set usually includes a fitted sheet, a flat sheet, and one pillowcase. Twin size sheets are commonly used in children's rooms, dormitories, and guest rooms, making them a versatile choice for different sleeping arrangements.