Designed with the athlete in mind and engineered for performance, the Summit L1 Top is a one-piece baselayer that you won’t want to take off until the alpine mission is complete. Engineered with minimal seams, it delivers targeted warmth and premier comfort – ideal when pushing the limits on the peak. Articulated patterning promotes mobility, while low-bulk merrow stitching gives heightened durability at critical areas. Part of the Summit Series collection – the world’s finest alpine equipment.