These colorful, lightweight and resilient mats are made of hygienic, closed-cell polyethylene foam, making them ideal for institutional class use. They can't absorb moisture, and are easily maintained with a sponge and the disinfectant of your choice. The blue/white/blue triple layer mats are a full 1" thick, composed of a layer of 4-pound density white foam sandwiched between two layers of 5-pound density blue foam. You can't get more mat for the money anywhere. We suggest you check 'em out!