TempurPedic Sheet Pima Cotton Single-ply Authentic 310 Thread Count Sheet Set (Eggshell, King) Cotton 100% extra-long-staple Pima Cotton with single-ply authentic 310 & 250 thread count (compare to typical 500+ thread count) True Sateen weave and lockstitch construction for durability Sized longer and wider than typical sheets for a more comfortable fit and secure tuck Designed for a perfect fit on any Tempur-Pedic mattress, even with an Ergo Base or mattress protector 360-degree 1-inch binding and patented corner straps provide a snug, tailored fi