DetailsTYR Men's Size Chart Take on every challenge in the TYR Men’s All American All Over Jammer Swimsuit. Designed for today’s athlete, it boasts a 100% polyester construction, making it nearly 20 times stronger than traditional swimwear. So ,whether your training takes you to the pool or the beach, you can be sure TYR’s Durafast One® fabrication will provide both a secure fit and fade-free color. TYR jammer swimsuits stop above the knee and feature both a compressive fit and adjustable drawcord waist. Allowing for unrestricted mobility, the jammer is ideal for athletes who want reliable coverage during every swim. TYR Training swimsuits are fully lined, ensure 4-way stretch technology and provide UPF 50+ sun protection. All Durafast One® suits are chlorine proof and sustain an impressive 300+ hours of performance.