Ideal for swim training and regular use. Speedo's exclusive Endurance+ is their longest lasting and best selling training suit fabric. Endurance+ is 100% chlorine resistant fabric designed to lasts 20 times longer than conventional swimwear fabrics. Four-Way Stretch technology also provides a body-hugging fit, great shape retention and soft comfort. Fabric and Care Endurance+: 50% Polyester/50% PBT Hand wash with cold clear water. Features Brief offers maximum range of motion and minimal drag. Four-way stretch technology provides a body-hugging fit. Great shape retention and soft comfort. Low moisture absorption and quick drying. Front gusset. Inner drawcord at waist for secure fit. Sizing/Fit Competition swimsuits are engineered to fit tightly on the body in order to reduce drag, and will feel slightly looser in the water. Swimmers wishing to achieve a looser fit are encouraged to choose a larger size.