It's rarely needed here, but when it is, I use my snowboard goggles (with a pin vent and adjustable vents) and helmet (which has a cloth liner, vents that can be closed, ear warmers, and a clip for the goggles). Fogging is not a problem as long as you keep moving to keep the air going in the goggle vents. I see they now have a version with electric fans! That's a bridge too silly, at least for me and for here.

Here's the hard sell http://www.smithoptics.com/us/techgoggle?lang=en