The Waterproof Socks.

These are the fleece-lined waterproof socks that keep extremities dry and warm down to temperatures as low as -30º F. The socks have a patented in-cuff seal that keep feet dry even when submerged. Used by the U.S. military, both 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. Made in the U.S. Men's sizes S (5-6), M (7-9), L (10-11), and XL (12-15). Women's sizes S (6-7), M (8-10), and L (11 and up). (4 1/2 oz.)