What Our Gearhead(R) Experts Are Saying: "Roomier fit means fewer cold spots for me. It's genuinely warm at 0F and still packs reasonably."We bank dependable warmth for deep-winter camps with the Trek 0F Down. A roomier cut reduces pressure points, while efficient baffles and draft controls help lock in heat on truly frigid nights. Durable fabrics and a smooth zip make it easy to live with on repeated cold-season trips.