-4F/-20C when I left this morning. First morning this year that I've bothered with the goggles. Unfortunately, about a third of the way to work I felt my helmet strap pop open. I think I must have caught a bit of my balaclava in it, so I stopped to refasten. Of course leather choppers and wool mitts aren't very dextrous so I had to take at least one off to be able to refasten. But when I went to reglove I discovered that the wool mitt had pulled out of the thumb of the overmitt and I couldn't get it back in. I wound up riding with a liner glove inside the wool mitt. Object lesson, leather overmitts work well, but I need to sew a loop on them so I don't have the same problem again. Hands were fine for the trip. Returning this evening I should have left off one of the morning layers, I was sweating too much.