EXO-R420 Helmet ShakeDescription EXO R420 Shake White The leading full face dot snell approved helmet. The EXO R420 helmet continues to set a new standard for Scorpion EXO's full face street helmets at a very competitive price point. An all new advanced LG polycarbonate shell is more aerodynamic and smaller resulting in an ultra lightweight SNELL approved helmet. The aero tuned ventilation system uses a large top vent and mouth vents engineered to allow more airflow to