These mats are designed to be used as teaching aids for skill development during training and practice sessions. Softer core of 50 ILD polyurethane foam provides more cushion 18 oz. knife coated vinyl for top and bottom covers Nylon mesh side panels that breathe, allowing air escape on landings Double stitched handles aid easy portability Quality equipment your athletes deserve. Since 1954. As an official supplier of gymnastics equipment to USA Gymnastics, AAI is proud of its continuing commitment to the development of gymnastics through participation in hundreds of National, State, Regional and local events affiliated with the USAG. AAI is the longest running partner in USAG's history. The set up, teardown, adjustment, or use of any piece of apparatus or mat, should only be done by, or under the supervision of a qualified instructor or coach. Mat Safety Tips Mats and protective equipment are not the complete answer to eliminating or reducing injuries. It is more important tha