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A synthetic insulation layer that became my favorite jacket. I got this jacket three years ago, and since then it has gone on nearly every adventure, from hiking in France to backpacking in the North Cascades. After 16 months of testing, the results are in. This is the best midlayer insulation jacket I have owned. So good that it has gone on every hike, backpacking trip, and international adventure since I got it. Four year+ update: This jacket is now called the Proton Hoody.