New Page 1 The culmination of years of testing and research, the Blue Seventy Helix Fullsleeve Triathlon Wetsuit is simply Blue Seventy's finest suit ever. For 2008 they introduce TST, torsional stretch technology, further isolating the shoulder panels from the body of the suit, to improve flexibility. Combined with the existing quick exit legs, reverse zipper and multi-stretch cuffs, the Helix improvements make for a faster, more comfortable suit. In 2007 this was the suit of choice for athletes in the pro ranks, and based on their feedback, has led to enhancements that will not change that perception.