The makers of Trybike bring you the CoConuts Helmet!  The helmet is robust, handy and comes with an adjustable inner ring which, by means of an adjustable headband, can always be adjusted to the right fit. The hard outer shell gives the helmet, in contrast to foam helmets, a longer life and better protection for children.  The design, ease of use and comfort means your child won't want to take it off! Hard plastic bowl with comfortable foam lining Adjusts with the simple turn of a knob  11 ventilation holes  Chin strap with a quick release  Extra Small - 44-51cm - 240 grams - extra light and narrow model Small - 47-53cm - 340 grams  Medium - 53-58cm - 420 grams  Top tip - measure the head circumference of your child just above their eyes for accurate size