Hey Steve,
For your interest non of these vests are boyancy rated in Australia .
I think the NP high hook was popular at the slalom national at Green island over winter??
Naish also make one called the defender. Floatation/impact
The np high hook is the one Karen is talking about, looks more like a floatation vest, Dakine ones are probably the least heard of.
I would say the np or Naish defender would be the go. I have sold both and they are as equally popular.
They do need to be a tight /snug fit or they will ride up a bit.