I attempted to do some prone shooting yesterday. It was a sunny 40 F when I left for the range, but dropped over the next hour to below freezing. I lost feeling in my fingers and they were a bit painful when I warmed them back up inside. Especially my trigger finger tip, it turned purple. I had a matt on the ground and was otherwise dressed for it. Are there any special tricks you guys use to practice in the cold in order to keep going?