I purchased this to wear under my full face motorcycle helmet and for those blizzard like days on the slopes.  It works really well for both.  I was afraid it might be too thick for my helmet but it fits like a glove. The material is thick enough to provide protection but thin enough to not interfere with my other equipment.

- I do suggest that you wash it before you wear it.  You never know what sort of chemicals and other paraphernalia have come in contact with this. I hand washed this with mild soap and the water in the sink turned blue. Just a suggestion.