I think its a necessity 100%. Not in the respect that it will save u from harm...but boy without it you dont have a chance. When it comes to the mountains...I dont worry about hitting anything myself for Ive done that(when I was a skier I hit a tree at about 40+mph racing) but I more worry about others crashing into me and then hitting my head. When you do fall, sometimes and mid range speeds if u have the helmet that can actually help you if you tumble on your head as you try and correct yourself.
Bottom line. I wear a helmet when I snowboard and mountainbike because for me it is 100% necessary...
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