Dakine Men's Summit Socks 60% Merino Wool 20% Acrylic 10% Nylon 7% Polyester 3% Spandex Imported Reinforced heel and toe for durability Spandex knit in ankle panel for no-sag fit Multi-density knitting provides warmth and cushioning to areas that need it most Terry loop foot bed for superior wicking and cushioning Three compression zones and venting panels Reinforced heel and toe for durability