Antiperspirant...that is a great idea.

I have found that if I put a hand warmer over my heart it warms the blood that is circulating out to the limbs. That helps to keep my whole body warm and keeps me in the woods longer. Also, boots that leave enough room for warm socks, but wiggle room too. If I can wiggle my toes it usually helps to warm them.

I have a native friend who swears by putting cayenne pepper in her boots...whatever works.