Our True Temp™ sheets with 37.5® Technology absorb excess heat to cool you and release it to warm you for comfortable sleep all night long. Pillowcases included. 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. Our sheets are designed to fit any mattress up to 15" mattress thickness.Includes:One oversized flat sheetOne fitted sheet (Split King and Split California King sets contain two Twin Long fitted sheets)Two pillowcasesLearn more about how to find the right sheet or watch our how-to videos.Discover how you can sleep at your Ideal Temperature with our True Temp™ Bedding. True Temp™ sheet set