TYR Durafast One® 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. Designed for today’s athlete, the TYR Durafast One® 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. Swimwear should always be rinsed in cold water after use and then air dried. TYR Durafast One®: 100% Polyester.