Living in Denver I train a lot on the front range. Thus I experience serious changes in altitude and temp. When I know it is going to be relatively cold up high, I'll wear a long sleeve UnderArmour cold gear base layer. This has not proven to be a good idea as it holds moisture (sweat) and makes for a very unenjoyable experience. Anyone have any suggestions for multi-temp baselayers that will need to pull duty in the 40s but also not kill me in the mid to high 70s? What about Craft???