• Photo of One K Defender Refit Helmet Liner

One K Defender Refit Helmet Liner


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With the One K™ Helmet Liners you can easily change 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. 


The base shells for the Defender are Medium and Large.

- Use the Medium size helmet shell with a Small liner to change the fit to a Small.

- Use the Large size helmet shell with an XLarge liner to change the fit to an XLarge.


Small 53-54CM (6 3/8 – 6 1/2) Large 57-58CM (7 1/8 – 7 1/4)
Medium 55-56CM (6 5/8 – 6 3/4) XLarge 59-60CM (7 3/8 – 7 1/2)