Holes in the jacket’s inner fleece trap heat when you need it. When you don’t, and you crack the front ventilating zips in the ripstop shell, they help the jacket transfer heat away from your body. It works—for the most part. The H2 Flow is great when you’re moving quickly (snowshoeing, backcountry skiing), but it’s a midlayer at its best on colder days. 15.4 oz
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