SmartWool Women's Hike Ultra Light Mini Socks 67% Merino Wool, 30% Nylon, 1% Elastane, 2% Knit in USA Mesh ventilation zone Flat knit toe seam Elasticized arch brace - Sock Height: Mini Style: SW0SW452 Care: Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.