The belt extender allows wearers with larger size requirements to use most Mustang Survival inflatable PFDs.

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.