Built for comfort and mobility, the O’Brien Men’s Flex V-Back features wide armholes, segmented panels with multiple hinge points and the Flex V-Back stretch panel to allow the life jacket to move with your body. Its BioLite construction adds breathability for faster drying and it is lighter and more environmentally friendly than traditional neoprene, while still providing exceptional comfort. With its full front zip closure and two concealed, adjustable belts, the Men’s Flex V-Back is easy to get into and provides a very secure fit. This is the ultimate life jacket for maintaining a maximum range of motion while still providing the safety that you need on the water. Life Jacket Features Lighter weight than Neoprene Split V-Back for maximum maneuverability Multiple front and side hinges for extra flexibility Zip closure and 2 concealed, adjustable belts for security Harmonized U.S. Coast Guard/Transport Canada Approved Jacket Sizing NOTE: Most wearers need to purchase a life jacket one size up from their typical shirt size. Shipping costs for all life jackets that are returned to Bart's for sizing issues must be paid by the customer. Size Chart (Chest Circumference) XS: 23 - 32 SM: 32 - 36 MD: 36 - 40 LG: 40 - 44 XL: 44 - 48 2XL: 48 - 52 3XL: 52 - 56