AAI manufactures a complete line of competition mats, all designed with the athlete's safety in mind. Meets USAG, NCAA and NFHS competition specifications Foam core of 12cm models consist of a top layer of polyethylene foam over a softer layer of polyurethane foam 18 oz. vinyl cover 2' 2.5cm hook and loop fasteners on the 12cm models for secure attachment Heat sealed top surfaces provide a uniform, seamless landing area WARNING ĘThis product contains chemicals known to the State of California to cause cancer, birth defects, and other reproductive harm.