The Super Foot Warmer Heated Mat Is Composed Of Waterproof Rugged Black Rubber Material That Is Best Used To Warm Feet Through Shoes Or Socks Operating On Merely 135 Watts The Surface Temperature Is Able To Reach Up To 130F Caution Should Be Taken When Placing The Foot Warmer On Delicate Floors Such As Carpet Linoleum Or Wood Due To The Risk Of Damage This Heated Mat Is Ideal For Use On Hard Cold Impervious Floors Such As Concrete Tile And Stone Heating Solution For Garages & Other Work Spaces Or Use On Cementtile Surfaces Under Desks Or Wherever Extra Heat Is Desired Tuvlisted For Safety This Mats Waterproof Surface Is Also Ideal For Use To Melt Snow From Dirty Boots Improves Circulation Comfort & Work Performance For People With With Cold Feet Who Workrelax In One Place