Wamsutta Soft Blend Sheets. 250 Thread Count. 50% Polyester 50% Cotton. The Softest,most durable sheet you'll ever own. Virtually wrinkle free for easy care. Fits mattress up to 13" deep. Made in USA by Wamsutta. Available in Bluebell, Sand, Pebble, Sunlight, Alabaster, Denim, Cherry & Fern.