ULTIMAT 4'X6'X1 3/8" - Fasteners All Sides Use: P.E., Gymnastics, Cheerleading, Martial Arts and more 18 oz. Vinyl cover uses double reinforced,nylon stitched inverted seams to create a smooth surface 1 3/8" firm cross-linked Foam designed for support in high impact activities Fasteners On All 4 Sides; So mats can be connected to make an expanded tumbling area Our firmest and lightest mat Size/Color: 4'X6'X1 3/8" - Royal