Endurance+ Fabric: Body made of 53% Polyester, 47% PBT. Drawstring waist & integral support for enhanced fit Engineered V cut panels for added comfort and security Front Liner made from 100% Polyester. A fresh iteration of our HyperBoom print has landed. Chase your goals in our sleek new HyperBoom V-Cut Jammer. Integral support and engineered V-cut panels leave you comfortable and secure in training. A drawstring waist lets you adjust the fit. Be ready to go again in the quick-drying Endurance+ fabric, designed for durability with high chlorine resistance. Body made of 53% Polyester, 47% PBT.