Pro Expert Matt 55 is an underlay made from extruded polystyrene (XPS). Thanks to higher density have perfect compressive strength (CS) thus protecting locks of laminated flooring against breaking. They level out uneven surfaces and muffle walking sounds to great extend. Thanks to the higher density and compressive strength, Pro Expert Matt 55 underlays prevent from breaking of flooring panel locks therefore it extends their long service life. It is offered in sheets which makes cutting and assembling fast and easy. The underlay is designed to apply for every type of flowing floors.