Oh...also wanted to add that I recently discovered Columbia's Omni Heat products and they are great. I have a baselayer type top and I bought it one size up from normal (so it's not tight...RSD in the upper body means no more tight clothing) but it fits close enough that I still get the benefit of the heat. It has these little metallic reflecters inside that use your own body heat to keep you warm. It's not as warm as a heating pad or anything...but it helps me from getting cold and covers a much larger area than a heating pad does. And because it does a good job of keeping me warm it means I don't have to load up with as many layers (which can get heavy and painful in their own right after a while). They have other things like socks, pants, shoes, coats, hats...but so far I just have the one shirt and have asked for a pair of the pants for Christmas.