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The Marmot Ares Vest's lightweight 600-fill down insulation brings us fiery warmth for rousing on frosty mornings from the comfort of our tent, while the polyester ripstop shell withstands active use when bushwhacking through the forest and stuffing it in our pack. Marmot's Down Defender keeps moisture-laden air and rainy weather from compromising the down's heat-trapping loft.