Made durable and comfortable, the Onvous Durable Training Jammer is designed to be your long-lasting, reliable, go-to training jammer. Whether it's for casual recreational lap swimming or competitive, rigorous, year-round swim training, the Durable Jammer is built to last. Built with a sleek & strong, 85% Polyester + 15% Spandex outer fabric and a thick, water-repelling 100% Polyester Full Inside Liner to ensure suit durability, optimal comfort, and timeless style. Elevate yourself both in and out of the water with the all-new Onvous Men's Durable Training Jammer / Practice Swim Suit. Designed and used by professional swimmers. *Refer to sizing information below.