Waterproof: It is important that the shade sail has a slope, an installation angle of 20 to 40 degrees, and maximum tension. It is not recommended for use during thunderstorms, heavy rain, storms, or snowy days. UV Protection - Blocking more UV rays, the awning is designed to provide sun protection and is ideal for outdoor use, such as patios or gardens. High Quality: High-quality workmanship with strong seams. Each corner has a stainless steel D-ring for easy installation. They attach easily to trees, fences, posts, and walls.