EUC. Size M. Sustainable and swim-ready, our Madewell Second Wave collection comes in feel-good recycled fabric. Sporty and protective, this cropped rash guard doubles as a supercute bikini top (we love it in a retro floral print). Full coverage. UPF 50 sun protection. 82% recycled nylon/18% elastane. Do Well: Nylon is recycled from pre-consumer waste that would otherwise go to landfills. Machine wash.