These exceptional mats, distributed by the Athletic Connection, are1-3/8″ thick cross-linked polyethylene and fold accordian style for easy storage. They are covered with tough 14oz vinyl 2′ wide panels. Velcro fastening strips are on ALL FOUR sides. Minimum of two 4×8′ mats are required for a reasonably safe workout area; two 5×10′ mats are nicer, and two 6×12′ mats are very roomy. Standard color is royal blue & can usually be shipped in 1-2 days.