Step up on the block and dive into the water in the Speedo Men's Endurance+ Solid Swim Jammer. Swim laps and train for that next big meet in comfort with 4-way stretch Endurance+ fabric for a body-hugging fit and shape retention, so you can focus on your strokes. This brief is designed to be as tough as you are, with 100% chlorine resistance to hold up through hours of training.