Speedo equals better fit, performance, quality and innovation! Great fitting Jammer styling offers the technical advantage of compression as well as greater comfort and modesty. Premium type 247B Lycra/Spandex. New popular poolside and lap-swimming trend. The Speedo Solid Jammer for men features a sleek, chlorine-resistant construction of Antron nylon and Lycra spandex. The shorts provide comfortable compression and more coverage. Ideal for swim training and regular use Jammer styling offers more coverage to the legs Speedo's exclusive Endurance+ is our longest lasting and best selling training suit fabric Endurance+ is 100% chlorine resistant fabric designed to lasts 20 times longer than conventional swimwear fabrics Four-Way Stretch technology also provides a body-hugging fit, great shape retention and soft comfort.