Pearl Izumi - Ride Elite Thermal Wool Socks 67% Merino wool, 30% nylon, 3% elastane Made in US Anatomic arch compression for a performance fit ELITE Transfer Merino wool yarns provide superior moisture transfer and insulation Autumn/Winter 2015 Flat toe seam construction provides superior comfort over toes Tall 21.5 cm cuff height; Unisex sizing