Craft Gore WS Crew Longsleeve Unisex Gore Windstopper.

 

The ultimate base layer for cold and windy conditions. Add Gore's lightest ever windproof, 4-way stretch fabric panel to Craft's excellent Pro Zero Crew Shirt and you have a very warm and windproof underlayer for a race suit or extreme cold. Gore WS is strategically applied to Pro Zero fabric in order to maximize protection where you need it and ensure moisture transfer from the skin. Minimize your layers while protecting your core with the new Gore WS Long Sleeve.

 

This stuff rocks. Nathan has raced in this on windy days at -20F and it's always in the race bag whenever conditions have potential cold and wind.