Shape:Intermediate Oval What's this? Sedici Viaggio ADV HelmetThe Viaggio Adventure Helmet features an injection molded ABS shell and creature comforts every ADV rider will appreciate. The Viaggio features a quick release clear face shield and a removable injection molded visor for easy customization. Additional features include a removable and washable comfort liner and a ventilated chin bar. The Sedici Viaggio Adventure Helmet is the perfect match for long distance riders who expect technical versatility and uncomplicated convenience.Shell:Hi-tech injection molded ABS shellPeak:Removable injection molded peakShield: Includes clear face shield Separate flip-down tinted sun visor Comfort: Chin-bar airflow vent with metal mesh Removable air-flow comfort padded lining Safety: Meets or exceeds DOT standards Double D-ring The Double D-ring closure is THE tried-and-true motorcycle helmet retention system. Consisting of two "D" shaped rings, the rider laces the opposing strap through the closure to secure the helmet. It is strong, simple, reliable and infinitely adjustable. Some helmets use alternative closure methods, but the Double D-ring remains the gold standard for these reasons. safety fastening