These thorlos mountaineering socks are a great mixture of wool and thorlon which gives great cushioning as well as maximum warmth and durability to these socks these socks feature thick cushioning in the ball and heel for reducing shock impact shear and blisters as well as light cushioning at the instep and the in the arch for protection against lace pad pressure these socks also contain spandex for better support and a better fitthey also feature a ventilation panel for extra comfort 10