Petra's 11.5 Ft. X 11.5 Ft. Waterproof Square Sun Sail Shade. Durable Woven Outdoor Patio Fabric w/Up To 90% UV Protection. 11.5x11.5 Foot (Terracotta) Dimension: 11.5' x 11.5' 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.