60% Cotton, 40% Polester This cotton sateen sheet set features state of the art cooling treatment that manages moisture levels so you stay cool, comfortable, and dry. 600 TC cross weave breathable sateen cotton rich fabric providing exceptional comfort and durability It comes with all-around elastic on 16" deep fitted sheet for snug and securely fits mattress sizes, up to a 18" mattress depth. Set includes: 1 Flat Sheet: 81"W x 96"L, 1 Fitted Sheet: 54"W x 75"L + 16"D, 2 Standard Pillowcases: 21"W x 31"L Care instructions: machine washable