Swiftwick Pursuit Ankle Socks Crafted with Merino wool the Pursuit features a reinforced heel and toe for maximum durability even at shorter cuff heights. Merino provides warmth in winter cooling in summer and optimized moisture absorption. Features Natural Merino moves moisture away from your feet keeping them dry odorless and blister-free Temperature control keeps you warm in winter and cool in summer64% Merino wool / 33% Nylon / 3% Spandex Machine wash cold. Tumble dry low. Do not bleach or iron | Swiftwick | Pursuit Ankle Socks | Size Large In Black | Nylon