Petra's Waterproof 20 Ft. x 20 Ft. x 20 x Ft. Triangle Sun Shade Sail. Durable Woven Outdoor Patio Fabric w/Water & 90% UV Protection. 20x20x20 Foot. (Sand) Dimension: 20' x 20' x 20' 200gsm UV stabilized, high density polyester. Waterproof and easy to install. Made of high-quality sun screen fabric,blocks up to 90% of harmful UV rays. Sun shade can be used over a patio, driveway or other outdoor area.