https://www.massdrop.com/buy/goosefeet-gear-down-socks
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<h2 class=”product_description__header”>Insulated Socks for Happy Feet</h2>
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Designed to keep you warm and cozy while resting at camp, these Goosefeet Gear down socks are made of 10D nylon and insulated with 850-fill-power premium goose down. The fabric is DWR-treated and 100-percent downproof, offering a soft, pleasant feel against the skin, while the down is treated with water-repellent DownTek to stay drier longer. Elastic ankle cuffs seal out the cold when you’re kicking it in your tent, hammock, or cabin. Because the liner and shell use the same lightweight material, these socks come in at 1.6 ounces (in size small). For the same reason, they’re not as suited to frequent walking as heavier-duty booties.
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