LINED. DURAFAST FABRIC IS TYR'S LINE OF HIGH-PERFORMANCE, 100% POLYESTER SUITS. DESIGNED TO BE FAST ENOUGH FOR COMPETITION AND TOUGH ENOUGH FOR TRAINING. DURAFAST IS CHLORINE-PROOF, LONGER-LASTING AND JUST PLAIN FAST. IT NEVER FADES. IT NEVER LOSES ITS STRETCH. SO YOU NEVER LOSE YOUR EDGE!