The Sateen weave bedding set is made of 230 thread count certified Egyptian Cotton giving you an even softer, silkier feel. And because we use the same extra-long staple Egyptian Cotton, you get sheets that look & feel newer for longer. Buttoned Up: All our duvet covers come with buttons, bigger than the usual and harder to come undone. Fully Covered: All the pillowcases are envelope encased ensuring your pillows don't escape. Any item on sale is strictly non-refundable.