We wear helmets for hydrofoiling all the time, it only takes once coming down flat on your head riding at 28 mph, or busting out an ear drum. It's like hitting concrete. At any rate IMO the Pro tec helmets are garbage. The ear straps are always falling off and in one season it starts peeling. Best helmet, this again of course is my opinion

is the Evolution from Vozsports.com, check it out. Expensive but strap stays on and you can even get a skull grill for you hardcores

Fairly new company, but make some great stuff.
Chad