Closed cell structure offers excellent durability and cushioning. Ribbed texture for better grip. Water resistant and easy to clean. Rolls for easy storage. The highly compressed smooth molded skin guarantees durability. The closed-cell structure makes the mats impervious to water and extremely easy to wash and keep clean. Although light-weight and easy to roll-up, the mats still offer a flat, non-slip, well-cushioned surface - a surface that won't chafe, or rub against the skin ... and one which always feels warm and comfortable to touch. AIREX® mats offer outstanding value.