Optimal Performance, 900 thread count, bed sheets are made with patented Kooltex yarns that create a permanent cooling effect through superior moisture wicking, helping you stay cool, dry, and comfortable all night long. The luxurious sateen weave provides a soft, smooth feel, while being wrinkle-free, anti-static, and hypoallergenic.  The deep pocket fitted sheet will fit mattresses up to 18 inches.