I don't expose skin below 15 F. I've biked for groceries at 6 F with 30 mph wind. I cover the vent in my fox rampage helmet with saran wrap. I wear a welder's helmet liner under helmet. I wear safety glasses to keep wind out of eyes. I wear Wells Lamont farmer mittens covered by oven mitts. I wear combat boots and 2 pairs socks, inner layer nylon. 4 layers below waist, 6 layers above. Beats trying to carry groceries home on the city bus.
I had better cold weather clothes in the US Army. 8 weeks before I ETS'd, my whole bag of TA-50 gear was stolen. On a command post exercise, our tents blew down. Company commander ordered all tents & duffle bags hauled to the motor pool. I was left on location with a cot, a radio a phone all night, with a Master Sergeant. I had long underwear, field jacket with liner, rain suit over that. He had a field jacket and shivered from 2 AM to 7 AM. When we got back to motor pool, our bags were stolen. I didn't buy replacement TA-50 since I was short, and regret it these days. I can't buy that quality gear on the economy.