@JayShower - thanks for the link, I am not against a helmet for water sports, but it needs to be designed for intended usage. As the article points out, the greater surface area of the helmet and it buoyancy actually de-accelerate your head even faster when it hits the water, which worsens your concussion. Hence my thoughts on the rock climbing helmet not being materially beneficial - outside of preventing you from injuries from hitting the ski/board in a crash. Waterskiing is a contact sport, injuries will happen , but concussions seem far more frequent in other sports. I’ve gotten a few concussions wrestling in HS & college, never skiing. Trying to learn how to wakeboard - yes, and that’s why I stopped :-)