All of our folding mats are designed and manufactured with the best materials available. We don"t make different quality mats such as "regular" and "firm". All of our mats will be what other companies sell as their best "firm" mat. We use 18 oz. vinyl coated nylon (heavy vinyl) for the cover. We reinforce all wear points such as corners. Our mat tops don"t have any sewed seams except along the edges. We use 2" thick cross-linked polyethylene foam.