SmartWool Margarita Socks Merino Wool - Nature's most technical, high-performance fibre. Its complex structure makes it remarkably soft against your skin, helps regulate your body temperature, and stays looking great wear after wear. Supportive Arch Brace - Compression Bands and flex zones that provide high performance and a secure fit. Moisture Management - SmartWool fibers absorb and evaporate moisture so feet stay drier for longer. Fabric Construction - Knit In USA Of Imported Yarn: 60% Merino Wool, 37% Nylon, 3% Elastane.