KEP FOAM IS MANDATORY AND MUST BE PURCHASED IN ADDITION TO THE HELMET. The foam will determine the final size of the helmet. For size M helmets, foam sizes range from 51 to 58. For size L helmets, foam sizesrange from 59 to 62. Helmet replacement foam KEP Forme Europe , suitable for all KEP ITALIA helmets. - Washable and removable- Compatible Air Control System for optimum head ventilation and unrivalled comfort - Sizes 51 to 58 for helmet size M (medium)- Sizes 59 to 62 for helmet size L (large).The padding is a very important element: its thickness determines how well the helmet fits the rider's head.- Made of a single piece, easy to fit inside the helmet.- Made from Coolmax® fabric, an innovative fiber that maintains a cool temperature and improves skin hydration.- Quickly evacuates moisture (dries very quickly)- Allows you to change the foam to fit either loose or tied hair, with 2 interchangeable foam pads of different sizes.