Alpaca wool socks are moisture wicking, insulating, hypoallergenic, lanolin free, and naturally odor resistant. Alpaca Survival Socks from Flory's Alpaca Farm are our best-selling socks - they're terry-lined all-terrain socks, great for hiking in the summer and keeping warm in the winter. Machine wash and dry (follow the label care instructions). Sock sizes are SMall (5-7), Medium (7-10), Large (10-13), XLarge (13-15). Love your feet and the environment, too - alpaca is a natural renewable fiber!