The OneK helmet is available in 3 different shell sizes (0 - 2). Combining the shells with a liner of any size, available in XS - XL, and XS - XL oval, will help you achieve a perfect fit.
The liner is antibacterially treated in a material that is quick drying, moisture transporting and washable.
The linen is also very good if you share the helmet with others.
Many buy two liners, either 2 pieces in the same size, so there is always a clean and dry liner when the other linen is washed or you want to change the size of the helmet for different reasons.
OneK helmets are available in three different sizes:
Should size 0 fit to liner XS and S
Should size 1 fit to liner XS, S and M
Should size 2 fit to liner L and XL