Bonded Foam Gymnastics Mat - 4'x8'x2" V-4 Blue Best bonded foam on the market 18 oz. Vinyl Cover. THIS MAT HAS VELCRO ON ALL 4 SIDES FOR THE ABILITY TO ATTACH MULTIPLE MATS TOGETHER. Resists fungus, bacteria and mildew Double-reinforced nylon stitching with inverted seams Heavier than polyurethane and polyethylene foam