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 (Medium, Large and X-Large) can make up all sizes.

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 accomodate a Large liner and cannot be size-adjusted but having an extra liner on hand is always nice. Use the X-Large size helmet with the XX-Large liner to change the fit to XX-Large

The base shells for the Defender are Medium, Large and X-Large.

- The Medium Shell can take a Medium, Small or X-Small Liner.

- The Large Shell can only take a Large Liner.

- The X-Large Shell can take a X-Large or XX-Large Liner.

X-Small	51 - 52CM	Large	57 - 58CM
Small	53 - 54CM	X-Large	59 - 60CM
Medium	55 - 56CM	XX-Large	61 - 62CM

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Helmet Accessories

GENERAL INFO & FAQS