Constructed of 185 gsm UV Protected High Density Polyethylene (HDPE) Shade Fabric with Strong Stitched Seams and Durable Stainless Steel D-Rings in each Corner.   All Edges are constructed with heavy duty double layered reinforced stitched seams that prevents fraying edges or getting out of shape. Blocks the majority of UV Rays and direct sunlight. Breathable material will still allow rain to pass thru but to a lesser extent.