Feelmax®Arctic, inside of this double layer sock is Coolmax®-fiber and the outside is made of Thermolite fiber. Quality high-teck fibers have excellent moisture management properties and they provide warmth for any cold-weather activity such as ice climbing and downhill skiing. FABRIC: Fabric: 45% polyester (Thermolite), 38% Polyester (Coolmax), 15% nylon, 5% other fibres SIZES: EU35-48