The One K Defender Pro helmet liner is a must for riders who need to alter the fit and feel of their One K Defernder Pro helmet. Riders can easily change the fit of their helmet by simply swapping out the liner. This is a must for riders who require a little added flexability from their helmet investment. This can include growing children, people who share helmets, those who wear their hair differently between events, or event those who require a little extra room in the winter for a headband. All One K Defender Pro helmets shells come in 1 of 2 sizes, a medium or a large.
- use a medium size helmet with a small or extra small liner to change the fit to a small or extra small.
- use a large size helmet with a medium, small or x-small liner to change the fit of the large into a medium, small or extra small.
- use a large size helmet with an extra large or XX large liner to change the fit of the helmet to extra large or XX large.