Alion Home Waterproof Woven Sun Shade Sail - Royal Blue (16 ft 5" Triangular) Waterproof fabric is constructed of high density polyester with UV-stabilized fabric. Sun shade is finished with strong stitched seam and durable stainless steel D ring on each corner. Protect against up to 95% harmful UV rays, and make your patio/pool safe, privacy and cool. Diversified shapes, sizes and colors to suit variant areas, and keep your kids privacy safe outdoors easily. Ideal for backyards, patios, decks, gathering areas, pools, gardens or anywhere you need a bit of shade and privacy.