If it's cold enough to wear while moving, sometimes I'll use a microfleece over my base. I think I'm going to try both a Patagonia R1 Hoody and an I/O Bio wool hoody in that roll this year. If it's windy, I'll add either a wind jacket or soft shell, depending on temperature and brush. To add warmth while sitting, it's synthetic or down puffy insulation, belay jacket style.
