CHECK THE SIZE CHART (in the image section above) The new Men's Dare2tri Mach3s.7 i the a great choice for a serious athlete. The black and red wetsuit utilises advanced materials such as 0.7mm Duraflex under arms construction and 44cell stability panels. GlideskinTM Technology and AquagripTM further adds to the improved performance of this wetsuit. Flexible 0.7mm Under Arms & 2.0mm Arms and ShouldersUltra thin 0.7mm DuraflexTM neoprene reinforced with an UltraFlexTM lining under arms and 2.0mm HBF-Limestone neoprene for the arms and shoulders construction gives the swimmer a 360° rotation of the arm with little resistance, allowing the swimmer to reach further with less effort. This benefit is multiplied as it reduces upper body fatigue over longer distances. Stability Panels5MM Made from HBF-Limestone neoprene, these stability panels help you adopt the ideal swimming position in the water. Unique Neck ClosureThe velcro closure on the rear is reversed so in the event the suit is closed incorrectly, only the soft material touches the skin.  Double Front Collar2 X 1 MM A double layer GlideSkin front collar prevent water ingress and allows movement that limit skin friction.  Aquagriptm Panels2.0MM Grip panels on the inside of the forearms and on the shins. The deep ridges in the grip panels reduce water turbulence and increase the surface area, leading to better propulsion around the forearms and lower legs.  Upper Chest Panel 3.0mmThis panel allows extra freedom of movement to the arm during the stroke.