From J. Crew: while keeping its old-school drawstring waist and adding a mesh lining to keep you comfortable in the water (and when you're lounging poolside or on the beach). Our lightweight stretch swimsuits are crafted from 57 percent ECONYL® yarn, a 100 percent regenerated fiber spun from nylon waste, including discarded fishing nets. It features a water-repellent finish made without fluorocarbons or PFCs. It also has UPF 50 protection, so this already hardworking fabric protects you from 98 percent of the sun's harmful UVA and UVB rays.