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As much as we like layering up and down for our mountain pursuits, we love the idea of a jacket that may not need to come off--like Rab's Vapour-Rise Alpine Light Jacket. Skirting the boundary between an outer layer and a midlayer, the Alpine Light combines an air-permeable Pertex Quantum Air shell with two polyester linings that work together to trap warm air for insulation, vent built-up heat during intense activities, and increase moisture vapor transmission. Warm, wicking, and wind resistant, this unique Vapour-Rise System forms an all-weather mountain layer that maintains a comfortable microclimate for hikers, climbers, and mountaineers while weighing only 11 ounces.