Liners that fit Cromo 2.0 helmets from KEP Italia. Available in two different designs depending on head shape, oval (O) or round (R). The oval liner is slightly more padded on the sides than the round one to ensure that the helmet sits securely on the head. The fit of the helmet is very important, both for comfort and to provide the best possible protection. To find your size, measure the circumference of your head, above your ears to the middle of your forehead, using a tape measure. Sizes 51-58 fit the M shell on the helmet. Sizes 59-62 fit the L shell on the helmet.