Gorilla Grip Durable Natural Rubber Door Mat, Waterproof, Low Profile, Heavy Duty Wee Doormat for Indoor and Outdoor, Easy Clean, Rug Mats for Entry, Patio, Busy Areas, 17x29, Gray Diamond. 4.6 out of 5 stars. 25,528. $24.99. $24. . 99. This versatile outdoor doormat features a heavy-duty but flexible design.