Mats are covered with 18 oz. tough fire-retardent 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. EnviroSafe foam mats are the eco-friendly alternative with the following features: 100% taxin free, zero VOC's or off gas, hypoallergenic, latex-free, mold and mildew proof, 100% recycleable with no leaching chemicals. EnviroSafe foam is available in 1 3/8" thick medium firm, and 2" thick softer feel. Mat folds every 2 feet to minimize storage space when not in use. Velcro ends allow mats to safely connect to other mat to