🚴♂️ Ride with Confidence, Style, and Safety! Fully adjustable for head sizes M (21.2-22.6 in) and L (22.7-24.1 in). Innovative 22-hole ventilation system keeps you cool during rides. Certified to meet US CPSC ASTM standards for ultimate protection. Detachable visor reduces glare and enhances visibility on the go. Thickened inner lining and cushioned fit for all-day comfort. Adjustable fit 22-hole ventilation High-impact resistance The Gudook Bike Helmet combines safety, comfort, and style for both men and women. With a lightweight design, high-impact resistance, and a unique ventilation system, this helmet is perfect for urban commuting, mountain biking, and more. Its adjustable fit and detachable visor make it a versatile choice for any cycling enthusiast.