Floor Muffler. The highest rated and most effective acoustic barrier on the market, moisture protection, mold and mildew resistant. Light, strong and flexible, making it easy to handle and install in nearly all conditions. Made in the USA. Surpasses California’s Indoor Air Quality emissions requirement for volatile organic compound (VOC) emissions. DIY- In stock at HFOfloors.com available in 100 sq.ft. and 600 sq.ft. rolls.