OTSO hats are ideal for winter and can be used for running, walking, ski mountaineering, ..., in general for all 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 breathability to keep the head always dry and sweat-free. The fabric is a blend of lycrasport and polyester, a perfect combination to ensure protection and breathability. MAIN FEATURES * UniSize * Entirely manufactured in the European Union * Thermoregulation * 100% Breathable * Sweat transport * Ventilation * 85% Polyester, 15% Lycrasport