This is made with 600 Denier nylon with a vinyl backing that makes this water resistant. 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.From the manufacturer:At K&H we know how much you care about your pets. That's why with over 20 years of experience, we design innovative, quality products to make their lives better.