Wearing a helmet when skiing or snowboarding is largely a personal choice - but the benefits are pretty obvious. They're compulsory in some resorts and terrain parks for this reason, so even if you wouldn't choose to wear one, it helps to know what you're looking for.
Why Wear a Helmet?
Because, the stats don't lie. Not wearing a helmet puts you at a much greater risk of severe injury, no matter how good a skier you are - most head injuries occur when other skiers crash into you.