Why choose the Scorpion Exo-391 Solid Black Full Face Helmet? The Scorpion Exo-391 is a great full face helmet by Scorpion for Urban/Street riders. Compared to any other style helmets, full face helmets provide the best overall protection as they cover you from top to chin. This is why you only ever see full face helmets on the track. When deciding on a new helmet and safety is your top priority you cannot go wrong with a full face helmet. Constructed from Polycarbonate, this Black Exo-391 offers excellent protection and performance without having to break the bank. The chinstrap is an important part of the helmet’s effectiveness in a Scorpion Exo-391 Solid Black Full Face Helmet Size M unisex.