One-K Defender Refit Replacement Helmet Liner
The One K Defender Refit Replacement Helmet Liner allows riders to customize the fit of their One K helmet with ease. Ideal for growing children, shared helmets, or riders who change their hairstyle between schooling and show, these liners provide flexible sizing without needing a new helmet.
Three base shells—Medium, Large, and X‑Large—accommodate multiple liner sizes. A Medium shell can be converted to Small or X‑Small by swapping liners, while an X‑Large shell can be adjusted to XX‑Large. The Large shell fits only a Large liner, though keeping an extra liner on hand is useful for freshness and convenience. This modular system ensures a precise, comfortable fit tailored to each rider’s needs.
Key Features:
- Flexible sizing system — swap liners to adjust helmet fit across multiple sizes
- Shell‑based fit options — Medium and X‑Large shells accommodate additional liner sizes
- Ideal for shared use — perfect for growing riders or helmets used for both schooling and show
Fits true to size. Measurements included in our Size Chart
For best results, dry clean or hand wash with natural detergent. Machine wash on delicate. Lay flat to dry.
Shipping
Orders can take 2-3 business days to process before shipping. As soon as your package has left our warehouse, you will receive a confirmation by email.
Returns
If for any reason you are unhappy with your purchase we offer returns for store credit within 7 days of delivery. If 7 days have passed since your purchase has been delivered, unfortunately, we are unable to offer you a credit or exchange.
