The Sheraton White 300TC Cotton Duvet Cover Set is made of 300 thread count 100% Cotton Sateen. Sateen is a smooth durable lustrous fabric usually made of cotton in satin weave. Sateen produces the sheen and softer feel using a different structure in the weaving process. The sateen weaving structure places most threads on the surface, making it extremely soft and durable. Warp yarns are floated over weft yarns, for example four over and one under. Standard plain weaves use a one-over, one-under structure. The long floats produce a smooth surface to the touch. Also, they don’t scatter light which increases shine.