Dakine Summit Sock 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