The Expand-a-Grip Luxury Fitted Toppper has 200 Thread Count 100% Cotton Top. The back is 100% Polyester. The Luxury Topper has a 24 ounce MicroDown siliconized polyester fill. The topper has a unique Cloud design quilting pattern. The Topper has a patented 16 inch skirt that will fit any mattress up to 17 inches thick.