These heavy alpaca socks are perfect for the active outdoors man. Alpaca's natural wicking ability will keep your feet warm AND dry. Heavy yarns and and plush terry knit provide support and amazingly soft, cushioned feel. Extreme socks have found favor with dog sledders, fly fisherman, hunters, skiers and snowboarders and "extreme" outdoor activities. Users have reported toasty warm feet in temperatures as low as 20 below zero!!