TYR's exclusive collection of 100% Polyester training suits last three times longer than traditional Lycra. The quick-drying Durafast material of the TYR Solid Durafast Diamondback Workout Bikini Swimsuit Set offers minimal moisture absorption and is soft, comfortable and easy on the skin. It has remarkable shape retention and memory thanks to a unique fabrication blend of polyester and PBT. In fact, not only is PBT a textured polyester yarn that has natural stretch characteristics, but it also provides exceptional chlorine resistance, refuses to fade and has a UPF 50+ rating for ultimate sun protection. Imagine that? A training suit that works as hard as you do.