SPEEDO Endurance Deep Within Flyback AdultEngineered from our exclusive, longest lasting and best-selling Endurance fabric.Chlorine resistant with superior color retention designed to lasts far longer than conventional swimwear.Unique four-way stretch provides body-hugging fit, great shape retention, and soft comfort.Helps resist sagging and bagging.Our best-selling back features thin strap reinforced with overlap binding for extra durability.Provides excellent support and freedom of motion.Perfect for competitive swimming and training.