The Essential Waterproof Triangle Sun Shade Sail An unpredictable forecast shouldn't compromise your outdoor plans. While traditional shade sails offer welcome relief from the sun, an unexpected shower can bring a gathering to a halt. Our sail is thoughtfully designed to provide elegant protection from both, ensuring your moments outdoors remain uninterrupted. This waterproof triangle sun shade sail features a high-density coating engineered to repel rain. Water simply beads up and rolls off, keeping your outdoor furniture-and you-comfortably dry. It's the difference between retreating indoors at the first sign of rain and continuing to relax, drink in hand, as the shower passes by.