Tredaire Superior 15sqm PU Foam Carpet Underlay: 2/6 Standard Durability, 4/6 luxury Comfort, 8.65mm Thick, 1.26 Tog, 90lb, 1.37m x 11.00m Roll Suitable for stretch-fit installation of carpets. A budget underlay for lounge, dining room, hall, stairs or landing, or a good underlay for main & guest bedrooms. This is the perfect sponge rubber carpet underlay for use all around the home. With a General Domestic rating (BS5808) this 8.65mm Tredaire sponge rubber waffle offers very good comfort & carpet protection. The air pockets in the waffle give very good heat & sound insulation capabilities.