The Surf Treehouse UPF Back Zip is a great swimsuit made from Extra Life Microfiber Lycra that gives long-lasting comfort, fit and shape with no bagging or sagging. Designed in a performance fit with five gauge zip at back, for minimal drag, and increased efficiency in the water. It's fully lined and offers good coverage plus internal shelf bra and removable padding for added comfort. Boasting an excellent sun protection rating of UPF 50+.