Both fabrics used in Ru9 Bedding Set are natural long-fiber cotton fabrics, in which Cotton Sateen has a 400 thread count, which is very soft and has a slight sheen, while Cotton Percale has a 200 thread count, giving it Lightweight and breathable feel. Whether you choose Cotton Sateen or Cotton Percale, you can rest assured that both are natural, non-irritating and will become softer and more comfortable with use and with each wash.