Performance compression swimwear packed with innovation. The Speedo Pro Jammer features a raft of technologies designed to help you accomplish more in training. Targeted quadricep compression achieved through internal powermesh panels and a glute support seam help to promotes increased kick power through reduced muscle oscillation. The jammer has a V-cut construction for added comfort and security, and a drawstring waist for enhanced fit and security. WINCOOL yarn helps regulate your body temperature during training while anti-bacterial technology helps to keep your suit fresh after your workout. Ultra chlorine-resistant, our INVISTA Lycra Xtra Life fabric lasts twice as long as standard swimwear.