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When winter temperatures really start dropping, the Marmot Guides Down Vest ups our core warmth to keep us nice and toasty. The 700-fill down insulation is light, lofty, highly compressible, and treated with water-resistant Down Defender to preserve the jacket's heat-trapping loft in damp weather. The durable polyester shell and lining have water-resistant coatings as well, so we're doubly protected against wet weather.