Rainleaf 13'x19' Rectangle Sun Shade Sail for UV Blocking, Stainless Steel Hardware Kit Included, Dark Green Made of HDPE. Durable & widely-usable. Stainless Steel Hardware Included. Blocks up to 93-95% of UV rays while enjoying the sun. Weight up to 200g per square meters. Environment friendly. Breathable enough to keep the cool wind in while keeping hot away. Easy Installation and Cleaning. Won't rot, mildew or mold. 5 years warranty. Widely used for swimming pool, patio, backyards, courtyards, gardens, etc.