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I often have to work up on a roof or siding off of a set of pump jacks.
There's little that's colder than being 20' up on the shady side standing on a 28' long aluminum heat sink with the breeze blowing right up your butt.
One of these little puppies in each jacket pocket will provide plenty of heat for up to 12 hours. http://www.zippo.com/Products/handWarmer.aspx
I fill them with Naptha, not lighter fluid. MUCH less expensive by the gallon.
It'll be 0*F when I leave for work in the morning
Edit: I'm a little rough on things. The first time one of those iron oxide/salt packs tears open in your pocket and ruins your clothes is the last time you'll use one.
I have a face guard that you breath through & it warms your body. It uses your bodies heat. I didn't think it would work but I sometimes get too hot when I use it on deer stands. I've set in the teens & stayed warm using it. Its called a Polarwrap heat exchanger. It works great. I got it at a sporting goods store.
Hot Hands. They work great. I've used them in pockets, gloves, boots, etc. and they've never let me down. Working football games in one of the top tunnels of Lane Stadium is one of the coldest and windiest places I've ever been.
-8° F at my house when I got home from work this morning. Wife loves when I come home on mornings like this and even after getting the woodstove loaded up and burning good my feet are still really, really cold.
Lighter fluid hand warmers, or chemical warmers etc. Are good. Jon-e-warmers are excellent and will last forever. The Chinese knock offs, not so good. Only problem is fuel smell, so if you are hunting that may be a problem.
Dual layers of wool or polypropylene socks. Gloves too.
A lot depends on what activity you have to perform when you don't have to stand still. If all you do is stand still and then just have to walk to your car etc, I really like the USGI style "Mickey Mouse" Boots. These are insulated boots with a double layer of rubber that has air inside for extra insulation. They are a lot bigger than regular boots, so that is why they are called Mickey Mouse.
Great if you just have to stand in snow for a long time and just walk occasionally. Not so good for long hikes or durability, at least compared to leather.
If you have to walk a lot thru rough terrain, then hunter type boots and good socks are probably your best bets.
As far as gloves, I like the typical rag wool gloves. REI and other sports stores sell good ones. Mine have lasted me since the late 80s and are just now getting thin. For extra protection get a good set of large insulated, maybe Goretex vapor barrier gloves. Synthetic covers shed the water better I think. To keep warm you never want to get wet.
With mickey mouse boots, thick wool socks, wool gloves with a good set of insulated gloves over that, plus long johns and sweater and jacket and Thick wool pants(Swiss army surplus), I have been comfortably warm laying on my back in snow for hours at a time with ice freezing on my front surfaces. I have been a "Victim" in snow rescue operations drills wearing this kind of gear. Didn't need chemical or fueled warmers with this gear but one in each jacket pocket makes a huge difference if it is really cold, the heat gets inside the jacket, mmmmm.