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.)
Check it here