Putting the proverbial handle on wet weather, wind, and all-around cold temps, the Arc'teryx Men's Proton AR Hooded Insulated Jacket is the one layer you won't want to leave behind the next time you venture into the alpine. Arc'teryx designed the Proton to function as a softshell when wind and light precip catches you hiking down from the summit or belaying three pitches up a route in the alpine. Being the warmest offering in the Proton line, the AR Hoodie is packed full with 90g Coreloft—insulation composed of crimped synthetic fibers that are breathable, compressible, and water-resistant—to deliver dependable warmth in demanding mountain environments. Never one to phone-in fit, Arc'teryx made sure the fit of this jacket promotes mobility and stretch while limiting needless bulk (and weight) when every ounce counts.
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