High Impact ABS Material Shell. ISI Certified with IS no.: IS 4151:2015 and CM/L no.: 1650145. Metallic Quick release silent buckle. Scratch resistant & UV resistant. Visor in optical polycarbonate, quick release visor mechanism, facilitates smooth and easy visor changes. 2 back exhaust vents. Open face helmets have an open cutout in a band across the eyes and nose and often include a clear or tinted transparent plastic face shield known as a visor, that generally swivels up and down to allow access to the face. Some of these helmets include vents to increase the airflow to the rider.