I have never been to vail, but I have boarded and done other activities in cold weather, in a low as -5degrees f As long as you have synthetic base layer and a water proof shell, middle layer can be just about anything. Fleece is a good insulating layer, cotton would work to if that is what you have, given base layer is synthetic. I would bring options, you don't want to get too hot, that synthetic layer can still become saturated, if that happens your hosed as you know.
Last edited by kysnowboarder; 12-27-2009 at 08:23 PM.
Reason: I am from ky, I can't spell, even with a spell checker