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These are the fleece-lined waterproof socks that keep extremities dry and warm down to temperatures as low as -30º F. Used by the U.S. military, the socks have an outer layer of nylon/Lycra for durability and a comfortable stretch fit, a waterproof middle layer, and an inner layer of expedition-weight, double-velour Polartec® fleece that wicks away moisture. Pressure tested to ensure against leaks. Made in the U.S. Socks Unisex Sizes S, M, L and XL. (4 1/2 oz.)
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Check out the New Balance Winter 110 runner!

What makes them special is their combination of low weight and rock protection, but what makes them popular is their fit. They're a bit like the race/comps of trail running: they fit universally snug but not tight enough to make your toenails black. An extra-grippy sole doesn't hurt either. They have a zipup "outer sock" is water resistant, keeping the water out of the inner laceup shoe, and keeping you running through our miserable Canadian winters.
Find them on www.newbalance.com