This is made with 600 Denier nylon with a vinyl backing that makes this waterproof. This house comes with and accommodates a Lectro Soft Outdoor Heated Kitty Bed that uses only 20 watts. The roof hangs over the 2 doors to keep cats warm, safe and dry. Includes removable door flaps for added protection. Easy to assemble with Velcro walls and a zippered roof.