FoxRiver Stowe Lite Quarter Crew Socks 45% Nylon, 26% Primaloft Polyester, 26% Merino Wool, 3% Spandex Made in US Lightweight Comfort mesh ventilation zones to maximize airflow and comfort are incorporated around the foot and along the Achilles Reinforced toe and heel add comfort and longer sock life Tapered comfort toe for a better fit on your toes, plus the smooth, flat toe seam has been moved back to avoid sensitivity Lightweight