So I am starting an AZT sobo thru in a few days. It is a bit late but had to go down this way. I am seeing temps come in and for much of the hike highs will be in the 50s. Is this too light of a baselayer?

http://www.icebreaker.com/en/midlaye...2064_color=003

I have a great microfleece to throw over it. A wind jacket. And a down just for camp. Should I make last minute switch to heavier baselayer?