Closed cut at the back.; 90% Polyester, 10% Elastane; Sample Size: S/36/1; Wash by hand in soapy warm water after each use. Do not use bleach or detergent. Do not keep the swimsuit in a wet, airless, closed, nylon bag. Dry it. Fluorescent colors fade in the sun, chlorinated water and sun oil will spoil your swimsuit.