Brand New KingPavonini leg pillow for side sleepers comes with a upgraded ice silk cover. The new cooling technology keeps the knee pillow cool and dry even after long-time use. Silky and breathable cover offer a soft touch, which is skin-friendly and help reduce sweating during use. Especially perfect for sleeping through all night. High density fabric is resistant to friction and not easy to pilling. CertiPUR-US Elastic Strap to Avoid Moving: Comes with an attached strap, the knee wedge pillow can stay in place without moving, eliminating the trouble of repeated reposition when you sleep to provide continuous support for your legs overnight.