The water,roof fabric and unique overhang roof design helps keep cats warm and dry and offers a comforting shelter that is large enough for up to 4 kitties. Includes and accommodates a medium K&H LectroSoft Outdoor Heated Bed. Includes LectroSoft medium to keep kitties warm. Large enough for up to 4 cats No tools needed to assemble. water,roof for use anywhere outdoors. Two exits so pet can not be trapped by predators. Sleep Surface Dimensions: 19" x 24"