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We're expanding our MTN Air collection into the winter months with a tour-ready midlayer. The Backcountry MTN Air EVOLVE Hooded Jacket offers the same lightweight design, unbeatable breathability, and weather defense as its summery counterpart, but with a Primaloft Active EVOLVE insulating layer that offers warmth without diminishing air permeability. The fixed hood and cinch-adjustable hem keep cold air locked out, and the stretch construction and active fit keep us moving.