Our finest cotton sheets are exceptionally soft and durable, made from responsibly sourced 100% Supima cotton for long lasting comfort. Pillowcases included. Supima cotton is a rare, superior type of cotton grown in the USA. It represents less than 1% of the cotton grown worldwide. Its extra-long staple fibers are strong and soft with excellent color retention. They resist pilling, breaking and tearing, for incredible resilience and long-lasting quality. ExactFit™ sheet design allows our sheets to stretch and move with our unique smart beds as they flex, and recover between uses, for a smooth, perfect fit. With our SmartFit™ design, sheets stay secure all night. A fully elasticized edge, elastic corner seams and anchor bands keep fitted sheets in place. Logic™ Labels on Sleep Number® bedding make it easy to see which way your bedding fits, right from the start. Simply align the labels at the bottom right corner for easy bed-making. These supima cotton sheets have a 600 thread count for lightweight softness and breathability. Our sheets are designed to fit any mattress up to 15" mattress thickness. Learn more about or watch our