Every time out. I've smacked my head on the ice err..uh I mean snow quite a few times and it's saved me. Also it's warmer than a hat. If it's snowing out I don't have to deal with a wet lid. Also when I wore a hat and put my goggles up on my head they would always fog up. I don't have that problem with the goggles on top of the helmet. OH yeah and my helmet has a strap to keep my goggles from landing 20 feet down the slope when I bail.