Our True Temp™ sheets with absorb excess heat to cool you and release it to warm you for comfortable sleep all night long. Pillowcases included. 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. Our sheets are designed to fit any mattress up to 15" mattress thickness. Learn more about or watch our Discover how you can sleep at your with our True Temp™ Bedding.