Inspired by our athletes with a thirst for lighter, faster-climbing gear, the Advanced Mountain Kit is the most sophisticated alpine climbing system we've ever created. This insulating midlayer sweater harnesses FutureFleece™ technology, which features a full-loop fabric construction that's made with octagonal shaped yarns with hollow cross-sections for higher thermal performance in a featherweight package. There's a stretch-knit buff integrated into the hood for added warmth and wind protection for the head and face in extreme conditions and a front half zip to shed heat while on the ascent.