Harkila Trail Socks are a technical trekking stock constructed with Copper Resistex which has antibacterial properties made from both natural and man made fibres. The Trail sock is designed for trekking in warmer weather to the demands made on your feet when active in the heat. Available in sizes Dark Olive / Willow Green in sizes S, M, L, XL Made using Resistex Copper a high tech yarn with copper which has anti static characteristics, excellent thermal conduction and antibacterial properties NanoGlide significantly reduces friction between sock and the skin, eliminating blisters and irritations, guaranteeing comfort and performance that an active person demands Flat seams to avoid chaffing when active Mesh zones for lightweight and great breathability 3D knitted toe for extra comfort Size: S - UK2-4 (EU35-38), M - UK5-8 (EU39-42), L - UK9-11 (EU43-45), XL - UK12-16 (EU46-50)