CanDo© accordion fold mats are durable enough for the school gym and clinic setting * Mats fold every 2 feet to minimize storage space when not in use * Velcro ends allow mats to safely connect to other mat to expand and form a larger mat surface * The 1-3/8 thick EnviroSafe© 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 * Mat is made with square side walls and is reinforced at all stress points for added durability * 1-3/8 thick EnviroSafe© foam has an extra-firm firmness * The EnviroSafe© foam mats are eco-friendly * 100% toxin free zero VOC?s or off gas hypoallergenic latex-free mold and mildew proof; 100% recyclable with no leaching chemicals