Insulator - 2 TOG - Helps keep the cold out and the warm in Acoustics - Absorbs noise by 21db approx. Water Resistance - Non-Absorbing Levels - Levels minor floor imperfections Supports - Braces board joints Durable - Mould resistant Lightweight - Easy to fit These unique extruded polystyrene boards absorb bumps and unevenness, cover over floorboard cracks, dampen impact sound, and resist moisture incursion. XPS underlay works with your floor to compress on foot contact, accentuating walking comfort and reducing the impact of a fall. Sold in packs that are lightweight to avoid the difficulties of fitting and handling and cutting. It is super quick to fit and significantly saves on waste. Similar to Fibreboard, XPS offers soundproofing and insulation.