O'Neal 10 Series Flow Helmet (Red/Yellow, Medium) Shell weight (50g): 1150 g (size M) Shell weight (50g): 1150 g (size M) Maximum airflow throughout the helmet, delivered by oversized vents and EPS channels Meets standards: DOT, ECE 22-05, AS/NZS and ACU Replacement liners/cheek pads and visors available