Our Survival Sock is a terry loop lined mid-weight sock designed for a wide range of outdoor activities and climates. The soft alpaca terry loops are combined with a durable nylon outer shell. Reinforced foot arch band and a ribbed knit ankle support ensure a proper fit every time. This warm and comfortable sock is one of our best selling styles across the country! Hypo-allergenic and odor resistant. Sock size chart in image list. Contents 78% U.S. Alpaca; 20% Nylon; and 2% Lycra. Care Instructions Machine Wash and Dry