Our duvet cover gets its luscious smoothness from pure, organic pima cotton, grown in the USA and sateen woven to a 500 thread count. American Supima has lustrous long-staple fibers that create exceptionally strong, silky yarns. Longer fibers make Supima cotton less likely to pill, ensuring that your bedding will stay smooth and comfortable wash after wash. Only fabrics made from 100% American pima can use the brand name Supima, and only 1% of all American Supima cotton is certified organic. Self-backed and finished with a simple knife-edge, an 8" interior flap and coconut shell buttons. Inside ties.