The Men's Nike Swim Hydrastrong Jammer is designed to combat water resistance during competitions. The front gusset and internal front lining allow for a better modest fit. The interior drawcord can be adjusted to get the perfect secure fit. Nike HydraStrong fabric provides long-lasting durability that you can depend on swim after swim. INTERIOR DRAWCORD for comfort and adjustability FRONT GUSSET for fit and comfort INTERNAL FRONT LINING for fit and modesty FLAT SEAMS for reduced chafing Nike HydraStrong fabric provides long-lasting durability, swim after swim Heat transfer Swoosh