The O'Brien Men's Aviator Life Jacket is designed with flex panels in the chest and shoulders and smooth side panels for comfort and flexibility. The double split back provides a more accommodating fit. Zip closure and 2 concealed belts offer security. Harmonized US Coast Guard and Transport Canada approved.• Chest/shoulder flex panels and smooth side panels• Tapered waist for accommodating feel• Oversized arm opening for superior mobility• Double split back panel for a more accommodating fit• Biolite outer front panels for comfortable fit• Zip closure and 2 concealed, adjustable belts for security• Multiple hinge points for maneuverability• PWC ring• Harmonized US Coast Guard and Transport Canada Approved• Men's Chest Sizes: XS(28"-32"), S(32"-36"), M(36"-40"), L(40"-44"), XL(44"-48"), 2XL(48"-52")NOTE: Aviator Life Jackets run large. It's recommended choosing a size smaller. Zip closure & 2 concealed, adjustable belts for security Multiple hinge points for maneuverability Harmonized US Coast Guard & Transport Canada Approved