I've only been skiing once. This was about 3 years ago.
But after skiing just once, on the easy slopes, I decided that I would never ski again without a helmet.
After a hard wipeout caused by me avoiding an out-of-control snowboarder, I was surprised at how hard I hit my head.
http://www.nypost.com/seven/03172009...ead_160027.htm
Apparently N. Richardson is brain-dead after a benign fall on an easy slope during ski instruction. My resolve to wear head protection is only stronger now.