37% Nylon/26% Merino Wool/17% Polyester/18% Acrylic/2% Lycra Spandex Made in US. NB DRY moisture management technology quickly moves sweat to keep feet cool and dry. Stability Fit built in for enhanced arch support. Anatomical left/right foot design for the ultimate fit. Strategic cushioning in strike zones. Breathable mesh panels promote airflow to keep feet feeling dry and cool.