Waterproof Rectangle Shade Sail Outdoor Canopy Awning, Patio and Pergola CoverOur Waterproof Rectangle Shade Sails are made of 220 GSM HDPE (high density polyethylene) with double layered reinforced stitched seam edges, stainless steel grade 316 d rings on each corner, all finished with commercial standard UV stabilization No water will go through our waterproof shade sails guaranteed Provides dense 95% shade coverage and 95% UV blockage Reduces ambient temperature by at least 10, saving you money on electricity and water bills