Classic cold weather details combine with lifetime guaranteed performance technology in the North Face Nuptse Purna Boot. Sleek waterproof velvet suede combines with durable ripstop nylon collar detail and a faux fur ruff in the upper. Cemented seam sealing joins the upper to the rubber sole with TNF patented Winter Grip tread pattern and IcePick temperature sensitivity for enhanced traction. Inside, 200g PrimaLoft Eco insulation keeps feet warm while compression-molded EVA Northotic footbed hel