Biking to church at 0 degrees Farenheit.
I overheated slightly on the top...I should have worn only three layers there instead of four. Otherwise I was fairly comfortable for the 15 minute ride.
I had preheated my hands a little by rubbing them with a little cayenne before I put them in my gloves, and then put the gloves inside these mittens.
At least my bike didn't break like the time I rode last year at 0F.