[Nick Heath]

I concur.  Just avoid anything too heavy or cumbersome or that could absorb loads  of water. I have a Petzl rock climbing/mountaineering helmet that (to me anyway) seems superior to the paddling helmets I have seen, They basically all do the same job.  Even a cheap bike or hockey  helmet should work well enough if the harness is properly adjusted, so the helmet can’t fall off from an impact (unlike those used  in the NHL that seem to fall off at the first punch!).

Nick