Royal Enfield Isi Certified Open Face Mlg Helmet With Clear Visor(Gloss Black-Size: M) is available on Amazon. Product Description:- Size for the helmets would be :XS: 53-54cm, S: 55-56 cm, M: 57-58cm, L: 59-60cm, XL: 61-62cm basis head measurement. Kindly refer image size chart for details. Expanded polystyrene inner lining ...