SUNNY GUARD Outdoor Shade Sail is an easy way to get the comfort you need to beat the American heat. Not only do these sails look beautiful, they are a great solution for enjoying a cool, shady outdoor space any time of year. High-density polyethylene sunshade fabric. A huge benefit of our performance fabric is its ability to “breathe”. The cool breeze blows slowly and the temperature drops by 15-20 degrees.