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 Dominate your training with the Nike Hydrastrong Solid Jammer. Find the perfect fit with an interior drawcord, internal front lining, and flat seams. Additional comfort is provided by the front gusset design. Nike Hydrastrong fabric ensures long-lasting performance and durability in chlorinated pools.