Designed specifically for use in welding areas, WeldSafe's surface expertly repels sparks and hot metal shards. It offers extra durability in heavy use situations and has a higher melt point of over 500 Degrees Fahrenheit. Its super resilient, Nitricell sponge base is a PVC/Nitrile rubber blend that offers immediate rebound and unparalleled support and comfort during long, strenuous shifts. Depend on WeldSafe to out-perform traditional anti-fatigue matting in spot-welding applications. Now available in a UltraSoft version that has a double thick 7/8" Nitricell sponge base.