The Men's Nike Swim Poly Solid 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