Ideal for swim training and regular use. Jammer styling offers more coverage to the legs. Speedo?'s exclusive Endurance is our longest lasting and best selling training suit fabric.Solid Endurance Male Jammer Youth Engineered from our exclusive, longest lasting and best-selling Endurance fabric: 100% chlorine resistant fabric designed to lasts 20 times longer than conventional swimwear fabrics. Four-Way Stretch technology providing a body-hugging fit, great shape retention and soft comfort. Helps resist sagging and bagging, keeping swimwear fitting newer longer. Low Moisture absorption and quick drying. Front gusset. -Inner drawschord at waist for secure fit. Ideal for swim training and regular use. Jammer styling offers more coverage to the legs. Fabric: 50% Polyester/50% PBT.