Compatible with 1.5″ webbing the Inflatable PFD Belt Extender increases the waist belt size by 12″. This extender is not compatible with older MD3052, MD3054, MD3082 and MD3084 models and any lot number beginning with a W. In Canada, wearing a belt extender voids the Canadian ULC approval for the PFD. In the United States, wearing the belt extender voids the US Coast Guard approval UNLESS the wearer has a chest size over 130cm or 52inches, in which case wearing an adult universally-sized PFD with a clip-on body strap extension DOES NOT void the approval.The Inflatable PFD Belt Extender increases the circumference of compatible PFDsFits inflatable PFDs with 1.5″ webbingCompatible with PFD models M.I.T. 100, M.I.T. 70, H.I.T., Pilot 38, Elite 28, and discontinued models including MD3183, MD3153, MD3181, MD5183, and MD5153Not compatible with PFD models that have 2″ webbing (including older models of MD3052, MD3054, MD3082 and MD3084 and any model with the lot number beginning with a W)WARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov