JUST1 J12 helmet was developed and designed with the primary goals of creating the safest and most comfortable motocross helmet for a Rider. Perfect fit is the essential element in helmet performance. The finest and technically advanced materials are used in the production of JUST1 J12 helmets. The external shell is made of full Carbon fiber. This makes the helmet extremely rigid and incredibly light weight. JUST1 J12 has two exterior shell sizes ensuring proper fit to weight ratio for safety and stability. The inner shell dimension (EPS foam and lightweight high impact absorption) is scaled to fit every size of the shell, JUST1 has two interior EPS sizes.