O'Brien Men's V-Back Orange Life JacketThe O'Brien Men's Aviator Life Vest features a double split back panel for a more accommodating fit. This comfortable and light-weight life jacket has a zip closure and two concealed belts for security. Features O'Brien's BioLite material-BioLite is an eco-friendly material that looks and feels like neoprene but contains no rubber foam or Volatile Organic Compounds.Features: 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 U.S. Coast Guard & Transport Canada Approved; Sizes Available Medium (36" - 40"); Large (40" - 44"); X-Large (44" - 48"); *Aviator life jackets run large. We recommend going down one size.United States Coast Guard Approved.