ROBERTS® AirGuard® Premium Underlayment is rated #1 for use under floating laminate and engineered wood flooring. AirGuard features the innovative AirFlow Technology that releases trapped moisture as a vapor to prevent damage to floors and subfloors. Its 3-layer design protects floating laminate and engineered hardwood flooring: The top layer is made of an impermeable film that keeps moisture away from flooring; the middle layer consists of thousands of cushioning, stabilizing polyshims that support the finished flooring; and the bottom layer is a permeable film that wicks moisture up from concrete or wood subfloors. ROBERTS AirGuard is the first underlayment to include MICROBAN® antimicrobial protection to safeguard the floors against moisture, mold, mildew and odor-causing bacteria. Recommended for residential and commercial applications, AirGuard is made in the USA.