Rainleaf 16'x16' Square Sun Shade Sail for UV Blocking, Stainless Steel Hardware Kit Included, Dark Green high density polyethylene(hdpe) 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. Perfect for driveway, swimming pool, patio, backyards, courtyards, gardens,bedroom,deck,sailboat,gazebo. Breathable enough to let cool wind in while keeping hot away, and let water through without ponding after rain. Ready to hang up. Easy Installation and Cleaning. Won't rot, mildew or mold. 5 years warranty.