The North Face Summit Series Women's L1 Top is a warm base layer for extreme alpine conditions. The system starts with the number 1, a form fit against the skin that adds warmth while also wicking moisture. Face it, you're gonna be cold but you're also going to sweat as you start your upwards quest to reach the top. The Thermolite® fabric is a polyester/elastane blend that is soft and stretches with every move you make. No uncomfortable restriction along the way. When you start to heat up, open up the long half-zip to vent heat quickly. Once the chills come along, zip 'er back up and move onto the next challenge.
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