CHECK THE SIZE CHART (in the image section above) The Men's Dare2Tri SwimRun Go is a great choice for the serious competitor. Using high quality neoprene and specially constructed high stretch shoulders and underarms provides flexibility where it matters. The smooth skin surface coating improved hydrodynamics and the front and back zippers make this extremely versatile for competition. Specifications:-2.0mm under arms and 2.5mm shoulder construction-39Cell neoprene-Smooth Skin Surface coating-Thigh pocket for storage-YKK stainless steel front and back zippers Features:  THINNER 2.0MM UNDER ARMS, 2.5MM SHOULDERSA 4-way stretch nylon that not only soft but very durable is used for the under arm construction. The shoulders are made of a 2.5mm thick smooth skin neoprene giving the swimmer improved 360° rotation of the arm and allowing the swimmer to reach further with less effort. This benefit is multiplied as it reduces upper body fatigue over longer distances.  THIGH POCKETTight fitting pocket to store essentials.  YKK FRONT AND BACK ZIPPERThe world's 1 zipper brand is utilized with a stainless steel runner.  LOWER YKK FRONT AND BACK ZIPPERs The world's 1 zipper brand is utilized with a stainless steel runner. The zipper is 5 cm longer and sits lower on the back. This eases and speeds up sliding the suit around the hips.