The North Face Summit Series Men's L1 Top is the base layer for cold, harsh alpine climbs. The form fitting top stays close to the body, Thermolite® fabric ready to add heat while wicking moisture. You stay comfortable and whenever you start to heat up, open the 1/2 zip to release the excess. Minimal seams to get in your way, so you move naturally, even under layers of clothing. The system works together, but it all starts at 1.
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