200 GSM breathable HDPE (High Density Polyethylene) material. UV Treated, Resistant to Mold & Mildew. 3 Year Warranty against UV degradation. Shade can be used over a patio, pool, deck, porch, garden, driveway, courtyard or backyard. Package Contents: 1 Sun Shade Sail with Stainless Steel Hardware Kit and Heavy Duty Nylon Rope(Free gift) Up to 90% of harmful UV rays are blocked while cool breezes and rain water pass through the knitted mesh. Sail comes finished with 3rd generation reinforced stitched seam and stainless steel "D" rings on each corner for easy hanging. You measure, we make it.We are not able to accept returns on custom size orders, please measure carefully before you order. Need more custom sizes, please contact with us.