Designed for floating floor materials, QuietWalk's recycled filaments are specially processed to cushion the floor to absorb sound, reducing unwanted noise. This helps make floating floors sound more like fastened wood. Although it can be installed over wood or concrete subfloors, QuietWalk can manage moisture that surfaces in the form of vapors that naturally come up from concrete subfloors. Since QuietWalk and concrete are both "breathable" capillary products, vapors that are emitted will never accumulate under the pad into harmful moisture, while the attached vapor barrier protects the overlying flooring from any attacking moisture. With QuietWalk flooring underlayment you get better moisture protection, as the fibers manage serious moisture concerns.