The Montane Alpha Guide Jacket provides torso protection in a new and unique way, using the revolutionary POLARTEC Alpha. With its open, woven construction, POLARTEC Alpha combines warmth with hyper breathability, while at the same time being extremely compressible. This new format of insulation is encased in PERTEX Microlight Stretch, which provides high wind resistance combined with the stretch needed for climbing movement. The jacket also features a stretch hood that fits underneath a climbing helmet and stretch arms with thumb loops. The Alpha Guide is not so much a piece of clothing, rather a piece of climbing equipment.