CozyCatFurniture Waterproof Insulated Cat House for Outdoor Use Thermal-Ply insulation that is placed inside the floor, walls and ceiling. WATERPROOF Cat House. Optional Back Door and Vinyl Flaps are Available. Cedar construction: The wood of choice for long-lasting outdoor use. Check the other outdoor cat houses we offer here: https://www.amazon.com/shops/cozycatfurniture Ships unassembled. Simple instructions included for fast assembly with a power screwdriver