Vitrex 1mm Underlay is ideal for use with vinyl click floors with integrated underlay (subject to flooring manufacturer guidelines). It's lightweight and easy to install, offering excellent performance on all sub-floors. Blocks out damp and cold and is moisture resistant. Excellent sound absorption of 19db. Perfect for maximising heat from underfloor heating, it's suitable for use for high traffic areas like kitchens and lounges and will protect LVT/SPC Click Systems. Made in the UK from recycled plastics. 9.6m2 coverage. Vitrex Underlays - The Secret to Better Flooring.