Coolaroo?s unique knitted high density polyethylene fabric is completely weTherproof 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 offThe hot grass and patio duringThe Summer and cold ground and floor inThe Winter. Easy on your pet?s joints and pressure points.