Hyper Lite Hyper Ventilation Helmet The back of the head uses a simple fitting system. 20mm thick polystyrene pad absorbs shock Lightweight helmet with a weight of 7.1 oz (200 g). Japan Fit standard product with a shape that fits Japanese people.
Material: (shell) polycarbonate, (liner) polystyrene foam
Weight: 7.1 oz (200 g)
Size: Head Circumference: 21.7 - 24.0 inches (55 - 61 cm).