4F U135 Cycling Helmet, Size S, 51-54 cm, Jet Black 4FWSS26AHELU135 20S The 4F helmet is perfect for both mountain biking and recreational riding. The in-mold construction (ABS/EPS) ensures lightweight and high damage resistance, guaranteeing effective protection. The constant ventilation system supports airflow and thermal comfort while riding. The removable liner with insect mesh improves hygiene and ease of cleaning. A rear dial adjustment allows for a quick helmet fit, while the adjustable chin strap increases stability. The model meets the EN 1078 standard, and reflective elements improve visibility in low light. Technical data: Size range (head circumference): 51-54 cm In-mold construction with an ABS/EPS shell ensures lower weight while being highly resistant to damage and scratches Fixed vents promote airflow Removable liner with insect mesh Rear helmet circumference adjustment with a dial Adjustable strap with chin guard Complies with the European Standard EN 1078 Reflective elements improve visibility in low light conditions