ur Waterproof Protectors are now made from Polyurethane (PU). This revolutionary development means that they're virtually soundless to sleep on. You might need a waterproof cover for your mattress, but you don't want to be reminded of it every time you turn over at night. Polyurethane is a subtle choice - it looks and feels incredibly soft and fine, with none of the creaks and squeaks that characterise some waterproof protectors. Now every waterproof protector in the range is made with this revolutionary, breathable lining. We put comfort first. On top of the waterproof PU is a layer of terry towelling (65% polyester, 35% cotton). It's quite a fine layer, so it doesn't add unnecessary bulk to your bedding. The protector has a skirt that stretches securely over the corners of your mattress.