The difference between a dream day and disaster boils down to how well you can keep from boiling up. Adapt to the highs and lows of elevation and exertion with a powerful pairing of our Airmesh technology and Primaloft Gold ACTIVE insulation. The Kor Alloy Tight off-loads excess body heat and moisture on the ascent and effectively insulates under your favorite shell on the descent. Pair it with the Kor Alloy Crew, this highly-breathable mid-layer delivers unparalleled performance to enhance all backcountry pursuits.