casco bambino oneal bb youth kini red bull 1 0BMX helmet with sturdy ABS shell Optimized airflow through multiple air vents and internal ventilation channels O'Neal Fidlock magnetic buckle (designed in Germany) for easy one handed fastening and release, providing maximum safety while riding Padded, removable, absorbent, and washable inner lining. Retention system for a perfect fit and easy one handed adjustment Exceeds EN1078 and CPSC safety standards for bicycle helmets Size XS 48 52cm Size S 52