SmartWool Men's Hike Ultra Light Mini Socks 69% Merino Wool, 29% Nylon, 1% Elastane, 1% Knit in USA Mesh ventilation zone Flat knit toe seam Elasticized arch brace Sock Height: Mini - Style: SW0SW450 Care: Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.