The belt extender allows wearers with larger size requirements to use most Mustang Survival inflatable PFDs and will add 12" to the waist belt. This belt extender fits PFDs with 1.5" buckles. 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.