The tubular structure coordinates the flow of air through the helmet to the cyclist's head, ensuring uniform ventilation in all conditions. Thermodynamic tests have shown how the Koroyd structure ensures a reduction of the heat of the head faster and at a lower temperature than both the classic eps helmets and the head without protection, you will have no more excuses not to wear the helmet. The tubular structure coordinates the flow of air through the helmet to the cyclist's head, ensuring uniform ventilation in all conditions. Thermodynamic tests have shown that the Koroyd structure ensures a reduction in the heat of the garment faster and at a lower temperature than both the classic helmets in eps and the head without protection, you will no longer have excuses for not wearing a helme.