The new SDL (Schuberth Dual Locking) System will be gradually applied to all models. This means that initially there will be some models still equipped with the previous LEVEL locking system you all already know. This quick guide is intended as an additional help for dealers to immediately identify the compatibility with the different helmets and homologations, as the SDL system cannot be adapted and applied to older helmets. In fact, doing so would void the homologation of the helmet as a whole along with the Schuberth warranty.