500 thread count 100% cotton sheets – pure white extra long-staple cotton full sheets, fits mattress 18'' deep pocket, sateen weave, soft cotton 4 piece bed sheets set merissa merissa sheet sets are made from 100% pure egyptian cotton combed yarn, fabric woven on modern european electronic auto looms, top quality processing for long lasting colours, brightness, soft & silky feel to make these sheet sets most comfortable and cozy.