. . . . "26664837"^^ . . . . . . . . . . . . . . . . . "1018386974"^^ . . . . . . . "7114"^^ . . . . . "Riddell Revolution helmets are a line of football helmets. The helmet brand is the most popular model in use in the National Football League, used by 83% of the players in the league as of 2008. The most recent model in the Revolution line is the Speedflex helmet. This model can come equipped with Riddell's HITS Technology, which consists of a sensor in the helmet that relays data regarding the severity of each hit to a computer system. The Speedflex also features a built-in hinged panel located on the front near the top. In head-on collisions, this panel gives by up to a quarter of an inch (6 mm), helping to absorb the impact. The Revolution helmet was conceived in an attempt to reduce the risk of head injuries such as concussions. What research has been done on the helmet's efficacy so far has been inconclusive."@en . . . "Riddell Revolution helmets are a line of football helmets. The helmet brand is the most popular model in use in the National Football League, used by 83% of the players in the league as of 2008. The most recent model in the Revolution line is the Speedflex helmet. This model can come equipped with Riddell's HITS Technology, which consists of a sensor in the helmet that relays data regarding the severity of each hit to a computer system. The Speedflex also features a built-in hinged panel located on the front near the top. In head-on collisions, this panel gives by up to a quarter of an inch (6 mm), helping to absorb the impact."@en . . . . . . . . . . . . "Revolution helmets"@en . . . . . . . . .