Coolaroo unique knitted high density polyethylene fabric is completely weatherproof and resists rips and tears and will never rot, mold or mildew. It allows air to pass freely through it to prevent heat build-up and keep your pet cooler. It can be easily washed clean with water. The raised steel frame (7 high) keeps your pet cleaner and off the hot grass and patio during the Summer and cold ground and floor in the Winter. Easy on your pet joints and pressure points.