This is the Giro helmet I ride in for many seasons now. It covers a larger area of the head than a standard bike helmet. It has fewer holes than bike helmets generally intended for fair weather and those holes in Giro are normally plugged up - great for rainy weather and low temperatures. The chin strap is superior to any I had on a bike helmet. I switch to my Giro.9 I soon as it is practical given temperatures and feel much more secure than in any bike helmet. I am not sure I've engaged in serious tumbles with that helmet on a bike, but certainly in many when skiing. I would be scared, on the other hand, to put on a bike helmet for skiing, as providing a mediocre protection and even getting in the way such as in the possibility of getting caught somewhere - too many compromises there to ensure an air flow.