This helmet model was specifically created for professional use, offering a combination of lightweight durability and unparalleled comfort. Featuring ten aluminum-grilled air vents, the helmet ensures efficient cooling and ventilation while keeping debris out. The rubberized wheel for headband size adjustment is easily operated, even while wearing gloves. The high-density ABS plastic outer shell is designed to withstand impacts from all angles, meeting both CE EN 397 and CE EN 12492 standards. The inner shell, made of high-density polystyrene, includes ducts for natural airflow and heat cycling. The inner padding is composed of two detachable and machine-washable pieces, a soft polyethylene headband and disc. The anti-allergic, moisture-absorbent, and odor-resistant fabric liner adds to the overall comfort. Size: Universal-adjustable between 53 to 63cm.