I have a size Small Pro-Tec Classic skate helmet, with the dual density foam. Then I ripped out the soft foam, so there is only the thicker foam. And rock that with a hat and goggles underneath. I used to not wear a helmet, but I made it in Whistler last year so I could go into the high level park, and now I actually wear it pretty often. Its not a ton of pretection, but has deffinetly helped me out. And its better than nothing.