Oval liner for OneK helmets, note that sizes XXXS, XXS, and XXL are only available in round form. Each liner covers two classic helmet sizes (cm) and is easy to remove and wash. The table below indicates which liner fits which shell.
OneK's liners are made of polyester and sit comfortably against the head without chafing. They are well ventilated with mesh on the sides to be comfortable to ride in both short and long sessions.
| Liner size | Cm | Shell size |
| XS | 51-52 | 0/1 (Small/Medium) |
| M | 55-56 | 1/2 (Medium) |
Oval liner for OneK helmets, note that sizes XXXS, XXS, and XXL are only available in round form. Each liner covers two classic helmet sizes (cm) and is easy to remove and wash. The table below indicates which liner fits which shell.
OneK's liners are made of polyester and sit comfortably against the head without chafing. They are well ventilated with mesh on the sides to be comfortable to ride in both short and long sessions.
| Liner size | Cm | Shell size |
| XS | 51-52 | 0/1 (Small/Medium) |
| M | 55-56 | 1/2 (Medium) |
