blueseventy 2015 Men's Helix Triathlon Wetsuit - for Open Water Swimming - Ironman & USAT Approved Ultrathin 1mm Yamamoto 40 Arms for comfort and speed Mapped Gender Specific Body Fit Panels to insure the best fit VO2 Chest Panel maximizes stretch during respiration Torsional Stretch Technology (TST) for unparalleled arm and shoulder mobility Quick Exit Legs for easy on and off