J.B. Extreme -30 Below XLR Winter Sock (2 Pairs) 25% nylon Content - 70% Merino Wool, 25% Nylon, 5% Spandex Double Cuff, Full Cushion, and Impact Support Zones (strategically reinforced zones) add superior comfort and protection Merino Wool - the finest quality of easy care wool for exceptional warmth and softness. Ankle & Arch Support- Strategically placed elastic to create grip for superior fit, comfort and performance Made in Canda!