Not sure what high-back bindings are. High backs are the actual plate that comes off the back of the binding and supports the back of your calf. The piece that can fold down. That's the high back. There are only about two or so bindings out there now without them so I'd assume high-back bindings are just all bindings.
Im all for having fun, showing your tits and getting fucked up on a river float but it can be done without being a pig.