The Helmet Skin is one of Bentley's alternate looks in Sly Cooper: Age of Thieves. It only takes ten Secret Bentley Masks to unlock this skin.
Description[]
"This was how Bentley looked during the Cooper Vault Job. Having been crippled by Clock-La a year earlier, Bentley made sure to protect himself from such an event with a hi-tech wheelchair and a bike helmet. Bentley is thankful that he now wears a different thing on his head now, as the helmet wasn't very good on him anyway..."