The stationary is what does it. I don't wear coats, and didn't bring one to the siyum. I've walked 2 miles in below freezing temperatures in Chicago, and it didn't bother me. I remember spending a lot of time outdoors in -40 real feel in just my everyday clothes. Moving even slightly makes a world of a difference for keeping warm. Fingers, ears, toes, and nose are a different story. As long as I got those covered, and I'm not stationary, I'm fine.