OTSO hats are ideal for winter and can be used for running, walking, mountain skiing,..., in general for all those outdoor activities during cold days when we need to protect our head and ears from low temperatures, but at the same time we need good perspiration to keep our heads always dry and sweat-free. The fabric is a blend of lycrasport and polyester, perfect combination to ensure protection and breathability. MAIN FEATURES Made entirely in the European Union Thermoregulation 100% Breathable Sweat transport ventilation 85% Polyester, 15% Lycrasport