Safety Kids Bike Helmet: This helmets provide professional protection for children through CE safety certification, please be assured that it will protect your child's head like Superman Lightweight: Our kids bike helmet have M: 52-56cm/20.5-22inch,Over 5 years, the weight of the helmet with the chin guard is about 450g. It can protects cervical spine and will not cause any burden to the head 2 IN 1 Detachable Helmet: Protect the little driver's face, mouth and chin. The kids helmet could allow the driver to apply more scenes with different riding styles, The thickened soft heat-sealed lining and chin pad avoid children’ heads from abrasions effectively. Our helmet with removable chin guard is a perfect 2 in 1 helmet for all mountain use and urban rides Adjustable System: The chin strap can be easily switched on and off by a clip mechanism. Children can easily snap on/of and adjust it by themselves to find their most comfortable state. There is 360 °adjustable buckle at the back, you can quickly adjust the size, the nylon belts are also easy to adjust Note: Please read the instruction manual before using the helmet; Please check the setting every time this helmet is worn. If any questions, please firstly contact with us by email