NOTE: This is NOT a non slip pad and may not be suitable for small rugs that slip. THIS RUG PAD DOES NOT CONTAIN AIR WITHIN THE FELT LIKE THE OTHER 32 OUNCE PADS. OURS IS THE MOST DENSE AND RESISTANT IN ITS CATEGORY! SUPREME 32(TM) 100% Recycled Felt Rug Pads are comprised of 32 ounces of 100% recycled felt content, which is compressed into a 3/8th of an inch thick pad--dense enough to stand up to the heaviest traffic, which helps extend the life of your area rugs, yet soft enough to provide comfort underfoot and protection for your hardwood floors with its extra-soft backing. SUPREME 32(TM) 100% Recycled Felt Rug Pads are extremely environmentally-friendly: they are made of 100% recycled carpet fibers; they provide excellent thermal insulation with an R-value of 2.12 (which makes them a great choice for over radiant heat floors); they are naturally hypo-allergenic, mold, mildew, and moth resistant; they are certified for the Carpet and Rug Institute"s Green Label for air quality; and, they satisfy the credit requirements for USGBC LEED® Rating Systems. SUPREME 32(TM) 100% Recycled Felt Rug Pads feature excellent acoustical properties, which makes them a great choice for use in apartments. SUPREME 32(TM) 100% Recycled Felt Rug Pads are a great choice for hard surfaces where you do not expect slippage, as these rug pads do not feature non-slip properties. SUPREME 32(TM) 100% Recycled Felt Rug Pads are the perfect choice for endurance and the environment!