One K Defender Helmet Liners- Multiple Sizes

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If a One K 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! Two shells make up all sizes. The base shells for the Defender are Medium and 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.

Use the Large size helmet with an X-Large or XX-Large liner to change the fit to X-Large or XX-Large.




XSmall 51-52cm (6 3/8 – 6 1/2)
Small 53-54 cm (6 5/8 – 6 3/4)
Medium 55-56 cm (6 7/8 – 7)
Large 57-58cm (7 1/8 – 7 1/4)
XLarge 59-60cm (7 3/8 – 7 1/2)
XXLarge 61-62cm (7 5/8 – 7 3/4)

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