Increase your home's comfort using this SELITBLOC 1.5 mm GripTec floor underlay. Made from a sound-insulative polystyrene (XPS) material, it helps muffle impact and walking noise. The water-resistant material hinders the growth of mould and mildew to enable installation in wet areas, such as bathrooms and kitchens. The 1.5-mm thick Selitbloc underlay for vinyl flooring supports use over underfloor heating systems. It comes as a 48-in W x 25-ft L foldable panel for a speedy DIY installation. Equipped with secure click-connection mechanisms, the low thermal-resistance underlay is easy to set up. It has a printed grid that makes it simple to cut. Its textured Griptec surface keeps vinyl boards from slipping. It covers up to 100 square feet.