Icebreaker_GT260 Ideal for cold-weather exercising, this midweight fabric is the warmest and most breathable performance base layer you'll find. We've teamed it with Icebreaker's most technical and athletic design features.

If you take your outdoors sport seriously, you'll need to take your outdoor clothing seriously, too. The Quantum Zip is the top for sportsmen who insist on warm, comfortable, non-friction fabrics that don't take up half their luggage. Added features of this premium top include reflective banding, a collar to keep out the wind and a zipped stash pocket on the chest.