The North Face Men's L1 Summit Top is the only layer you never need to take off, from day one until your mission is complete. Keeping you warm and comfortable, this first layer for alpine endeavors baselayer with its engineered fabric and articulated patterning, it's been designed specifically for alpine comfort and mobility. Its knit fabric provides zonal warmth and moisture management, with minimal seaming whilst the merrow stitch construction provides a more accurate and reliable stitch while eliminating bulk and improving comfort. The extra long center front zipper helps you to control your ventilation thoughout your adventure. The 2015 Summit Seriesâ„¢ collection represents the worldâ€™s finest alpine equipment, reimagined.