Since I also Telemark ski, it was a natural progression for me to wear Boeri ski helmets in -30 F (real feel-real numb) commuting in Boston. Also brain buckets are not only about preventing TBI but also about enjoying our sport.

I personally feel safer, more secure, and definitely warmer (since I'm genetically endowed with an NBA style head ;-), in a Boeri than when I'm wearing a highly vented, high-tech Giro.

In fact, I have two Boeri - a tough, heavy (fullback) Beemer Blue model for commuting in Boston traffic in blizzards and a lighter silver QB or place-kicker model (with a Patriots' decal) for most of the winter. I also wear a North Face hat under the Boeri and attach a flashing red light to the convenient strap on the back of the helmet.

http://store.yahoo.com/skishop/botaskihep.html

But of course, in Durango during July, I wear a white Giro Eclipse and fancy I'm Ned Overend doing single track ;-)

http://www.touringcyclist.com/clothing/model_14572.html