53% Polyester - 47% PBT Front lined, 100% Polyester Interior drawcord Front gusset Flat seams for reduced chafing Make a statement with cutting edge style and materials. The Nike Vex Jammer is equipped with Hydrastrong fabric for fantastic chlorine resistance and long-term durability swim after swim. An interior drawcord and front gusset enable a proper fit and comfortable adjustability. An internal front lining aids in modesty.