Thorlos MBS 3-Pack Boot Sock With X-Static Exclusive THORLON construction for resiliency, durability and better wicking X-Static -The Silver Fiber is knitted into the foot area to provide permanent anti-microbial and anti-odor benefits Moderate cushioning in ball/heel for reducing shock, impact, shear and blisters Ventilation panel for better wicking Thin cushioning in instep and arch provides a more comfortable fit and ultimate support