Add-a-mat velcro ends allow mats to safely connect to other mat to "expand" and form a larger mat surface. CanDo accordion fold mats are durable enough for the school, gym and clinic setting. The accordion fold mats fold every 2 feet to minimize storage space when not in use. The 2" thick poly-urethane foam mats are covered with 18 oz. tough fire-retardant phthalate-free PVC coated vinyl; cover is sewn around foam. The vinyl coated nylon cover is strong, mildew resistant, anti-bacterial and wipes clean with a damp cloth. The mat is made with square side walls and is reinforced at all stress points for added durability. 2" thick Poly-urethane mats for a softer feel, used when cushioning is most important. Various sizes and colors available.