The Outdoor Heated Kitty House comes with and accommodates a Kitty Lectro-Soft. Made of 600 denier nylon with a vinyl backing that makes the Kitty House waterproof. The roof hangs over the 2 doors to keep cats warm, safe, and dry. The Outdoor Heated Kitty House is easy to assemble with Velcro walls and a zippered roof. We also carry the unheated model as an additional option.