Haha, Oh come on, it's not like your living in Finland or Canada. If your cold buy one of Geoff's freezer suits, or wear your ski gear, or just put on a hat (that's where most heat loss occurs). I have some of those chemical hand warmer packs that I have carried around for years and never used. How many time will you snag the cable on the tripod or scope before you rip it off?
