All good advice PG and bonsaihiker.
Another thing that works great is very hot but not boiling water in a reliable, leak proof bottle. Nalgene is a popular choice, but I've used Gatorade bottles with no problem.
Best to put the hot water bottle inside a sock so it's not in direct contact with the skin.
The hot water bottle is often used at night, at the feet or between the legs (femoral artery), but it can be used during the day as well. Maybe the femoral arteries when sitting.
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