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.
For more details visit the USCG web site at https://www.uscg.mil/hq/cg5/cg5214/pfdselection.asp#faq
Industrial Marine, Law Enforcement, Search & Rescue, Coast Guard