Lang - Indoor/Outdoor Door Mat - My Den, Exclusive Artwork by LoriLynn Simms - 100% Polyester - Slip-Resistant Rubber Backing - 18" h x 30" w Exclusive Artwork by LoriLynn Simms Full-color, durable, 100% polyester. Slip resistant rubber-textured backing. Pile Height: 0.25", Width: 18", Length: 30" Indoor or outdoor use.