Instahut Waterproof Shade Sail 2x4m Rectangle Sand 95% Shade ClothHeavy Duty Shade Sail Canopy 2 x 4M Sand Set sail into the sunset. A simply beautiful experience. Similarly, that's also true with our Shade Sail. Designed to be a permanent covering, our Shade Sail is highly waterproof and commercial grade 100% polyethylene fabric. This allows cooling air to pass through and help keep the under shade areas well ventilated. The material also blocks up to 98% of harmful UV rays and is all weather proof to suit