If a One K™ CCS MIPS Helmet does not come in your size, you can easily change the liner for a perfect fit. Our liners also provide ultimate flexibility for growing children, shared helmets, or women who wear hair differently for schooling and show! 
 
Note: If helmet is a long oval you will need a long oval refit liner.

Three shells make up all sizes! The base shells are Medium, Large and X-Large. Use the Medium size helmet with a Small or X-Small liner to change the fit of the Medium helmet into a Small or X-Small. The Large shell will only accommodate a Large liner and cannot be size-adjusted. Use the X-Large size helmet with the XX-Large liner to change the fit to XX-Large.