Smartwool Womens Hike Ultra Light Crew 67% Merino Wool, 30% Nylon, 1% Elastane, 2% Polyester Made in USA Ultra Light Cushion: Minimal cushioning for maximum performance in close-fitting shoes Mesh ventilation zone - Flat knit toe seam Elasticized arch brace - Sock Height: Crew Knit in USA of Imported Yarn Style: SW0SW453