Took this jacket up Mt. Rainier last week for it's first use and it performed WONDERFULLY. Hiking up to Camp Muir (10,000 feet) we were in a cloud cover at about 28-30 degrees Fahrenheit. Cold enough to need a jacket, but the level of activity and heat output from my body requires a jacket that can BREATHE. This jacket BREATHES. The soft, stretchy new Polartec Neoshell was more breathable than my
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