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! 

THREE SHELLS MAKE UP ALL SIZES.

XSmall, Small and Medium Helmets are built on a
Medium Shell – Use XSmall or Small liner to size down.
Use Medium liner for Medium size fit.

Large Helmets are built on a
Large Shell – Use Large liner only.

XLarge helmets are built on a
XLarge Shell – Use XLarge liner for XLarge fit.
Use XXLarge liner to size up.