The O'Brien Flex V-Back Life Vest is made of lightweight Biolite material that's faster drying than standard neoprene. Designed with multiple hinge points for a comfortable fit, the vest features a split V-back stretch panel and wide armholes to increase mobility and comfort. Zip closure and 2 concealed belts offer a secure fit. Harmonized U.S. Coast Guard and Transport Canada approved.• Flex Fit design stretches and wraps around the contours of your body• Split V-Back Stretch Panel for maximum maneuverability and comfort• Soft, lightweight BioLite construction is breathable and eco-friendly• Zip closure for an easy entry and secure fit• Two adjustable belts will stay out of the way• Multiple front and side hinges enhance range of motion• Wide armholes improve mobility• PWC lanyard attachment ring• Harmonized U.S. Coast Guard and Transport Canada Approved• Chest sizes: S(32"-36"), M(36"-40"), L(40"-44"), XL(44"-48"), 2XL(48"-52") Made of soft, lightweight BioLite that's breathable and faster drying Zip closure and 2 concealed belts for a secure fit Harmonized U.S. Coast Guard and Transport Canada approved | Men's Flex V-Back Life Jacket in Black/Grey