The belt extender allows wearers with larger size requirements, to get the most use out of your Mustang Survival inflatable PFDs. Adding twelve inches to the waist belt, you can be safe, wear your vest comfortably, and all while doing what you love. Does not fit inflatable PFD models with 2" webbing Includes older models of: MD3052, MD3054, MD3082 and MD3084 and any model with the lot number beginning with a W 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 In Canada, wearing a belt extender voids the Canadian ULC approval for the PFD