Our heaviest weight Alpaca sock. Alpaca (–better than wool) socks wick away moisture while keeping your feet cozy warm in winter. Alpaca wicks so well it is practically waterproof. It insulates 30% better than Merino wool in any conditions warm-cold. They are durable and they are warm. These socks are thermal-regulating and perfect for extreme temperatures or when you need heavy socks while sitting outside at the football games. This field sock is the perfect choice for everything from barn chores and winter sports like ice fishing or just playing in the snow. Silver technology means anti-microbial with no odor or sweat, and it helps prevent athlete’s feet. 9″ crew socks and “Over the Calf” styes. Sizes medium through XL are available. Made in the USA.