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 a Pertex® Quantum Air shell with a strategically-mapped hybrid of AirMesh™ lining and Primaloft® Gold Active insulation for the perfect combination of warmth, wind resistance, and breathability. The Kor Alloy™ Jacket off-loads excess body heat and moisture on the ascent and effectively insulates under your favorite shell on the descent. This highly-breathable mid-layer delivers unparalleled performance to enhance all backcountry pursuits.