Alion Home HDPE 180 GSM Sun Shade Sail - Color SAND - Size (9 ft 10 inch) SQUARE 180 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. Need more custom sizes, please contact with us. 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. Easy installation and no maintenance required. Can be taken down during the winter.