Get Helmet Size Chart Mt Gif. Helmet serves the primary purpose of keeping your head safe and protecting it in the event of an accident. The one k helmets are available in 3 shell sizes.
In order to best determine fit, we advise comparing our helmet's measurements to a similar helmets you already own.
This system allows the helmet to grow with the young rider. Use the chart to convert measurement to hat size. Select your head circumference using the left side of the chart to the right and select your helmet sizing. One k has options for perfect the fit.