Speedy swimming is about more than just being strong and fit. Body position, ergonomics, and buoyancy all play a big role in helping you get to T1 as quickly as possible, and Blueseventy engineered the Reaction Men's Wetsuit to improve all three benchmarks to help you swim faster, smoother, and more efficiently. The suit is made from Yamamoto 39 cell neoprene, generally understood to be the best there is, and sports different thicknesses in different places to improve your swim and help save energy for the bike and run. Blueseventy designed the Reaction with its 4 5 4 pattern. Around the chest and lower legs, 4mm thick neoprene lets your body sink slightly into the water for more efficient strokes and kicks, while 5mm neoprene panels at the torso and behind the hips raises your midsection slightly to reduce drag, create an efficient downhill swimming position, and help minimize inefficient side to side roll. Also worth noting is the SCS hydrodynamic silicone coating, which reduces friction and lets you slip through the water like a greased seal. Under the arms and around the shoulders, the Reaction sports thin 1. 5mm panels that allow increased flexibility for smooth strokes. The split VO2 chest panel gives your lungs plenty of room to expand and contract, and Blueseventy's Orange A Flex inner jersey and long rear zipper let you slip easily out of the suit and through T1 before your competitors have had a chance to catch up.