Speedo Big Girls' Youth Flyback Endurance+ Training One Piece Swimsuit, Navy/Blue 50% Polyester/50% PBT 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 Thin, streamlined straps are reinforced with overlap binding for extra durability Quick-drying and 20 times more fade resistant than standard swimwear fabric