We know it may be cold, but we're still going to be working up a sweat. That's why we're wearing Icebreakers breathable ZoneKnite Insulated Long-Sleeve hoodie to keep us regulated. It mixes warm merino wool that is quick-wicking and fast-drying (and also has the added benefit of fending off bad odors) with their ZoneKnit technology which uses a body-mapped design to keep us at the perfect in-between of aired out and heated up.