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Rely on this waterproof boot crafted with 200 g PrimaLoft® Eco insulation for the ultimate in cold-weather defense—even in temperatures as low as -25«F. PrimaLoft® Eco insulation delivers maximum warmth with minimal environmental impact. Seam-sealed waterproof construction is reinforced with a lightweight, waterproof shell designed with flexible grooves to keep you nimble when you're traversing treacherous terrain. Finished with a fleece-lined collar added comfort. Abrasion-resistant TNF™ Winter Grip® rubber sole with IcePick® lugs gains traction on frozen surfaces. Gaiter-compatible D-ring for backcountry excursions.