Speedo Women's PowerFLEX Eco Swim Skirt With Compression Short Swimsuit 80% Nylon/20% Lycra Speedo Core Compression features strategically placed mesh compression fabric that trims and slims for a flattering fit. Provides resistance to suntan lotions, skin oils and chlorine better than conventional fabrics. Helps resist sagging and bagging, keeping swimwear fitting durable swim after swim. Sewn-in bikini bottom. Fabric: 80% Nylon/20% LYCRA XTRA LIFE fiber.