Natural Satin Silk Pillowcase with Envelope Closure: AR WARE Introduces a Satin Pillowcase which is exceptionally smooth and cool-to-the-touch material make the most of your beauty sleep with this luxurious silk pillowcase, perfect for all skin and hair types, Our pillowcase is made of 100% , hypoallergenic and breathable silk fibres. A great bedhead saver and healthy skin helper. Material: 100% Polyester.