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Item Description Let your floor breathe! This multifunctional underlayment from Kronoswiss provides heavy duty sound insulation underlayment. Optimized through extensive test series and laboratory tests to provide high-level, lasting impact sound insulation. Kronoswiss ProVent not only effectively minimizes the noise level when walked on, but also the sound level transmitted through the floor into adjacent rooms. Rated STC67 IIC 71 provides great noise insulation; perfect choice especially in condos and other multi-floor constructions. Unique Micropumping System supports air circulation. ProVent underlay is shaped to allow the formation of a system of air channels which ensures a constant exchange of air when walked on and also eliminates water vapor from the floor.