Rear sizing dial with integrated light Fidlock clasp technology for pinch free opening and closing Adjustable side locking dividers Cycling or Scooting, every child should be wearing a helmet to keep them protected from accidents. Micro Scooter's deluxe helmets come packed with the very latest technology to help get them wearing a helmet fun and fuss-free. Featuring a magnetic buckle (fidlock technology) to stop accidental pinching as well as making it easy to clip on and off, the adjustable side locking dividers make getting the right fit the first time simple. Complete with a cool dinosaur-inspired design, the extra padding and Micro guarantee both ensure a Micro head is a happy head. Medium fits 53-58cm. Please choose the size carefully and measure the full circumference of your child's head.