Woven with active biomechanics in mind, this sock is built with mid-foot compression and our unique EHS (Ergonomic Holding System) Slingshot band that wraps the heel pocket to prevent slippage in high aerobic activity and keeps the socks comfortably in place no matter the pace.Keep those unwanted odours away when you remove your boots to rest those tired feet after a day in the hills with Argentium silver ion technologyYour feet will breath better thanks to the Opti-Mesh panel at the instep & # 174; Sock sizess - 3-5 m - 5-7L - 7-9