85% Polyester, 15% Spandex Imported Please reference Speedo’s New & Improved size chart for your optimal sizing. Keep in mind that our competitive suits are ULTRA COMPRESSIVE to reduce drag in water. If you prefer a more comfortable fit, please size up. Review Competitive Fit size chart before purchase; Swimmers wishing to achieve a looser fit are encouraged to choose a larger size. Compression for increased performance and faster recovery Fully lined. Sizing: Our competition swimsuits are engineered to fit tightly on the body in order to reduce drag, and will feel slightly looser in the water.