First, keep your core warm as possible.
Second, take set of socks off when you get to the stand that you've sweated in while walking in. Put in plastic zip lock bag. Tak out your toe warmers, and presuming you have a roomy boot like others have mentioned. Take a dry set of wool socks out to wear while hunting. I see several interesting replies about Artic Shield and antiperspirant. Those sound good too.
A buddy I know talked about battery powered socks. They are supposed to be great. When paired with what is mentioned above, ought to be a good supplement
