They're made with a combination of thing like silicon, silicone and gold, plus rubber casing, so they can twist and fold. Research done at UI gets used by a company called MC-10.
UI Material Science and Engineering professor John Rogers is one of the group's co-founders. An LED light on the helmet would turn red, yellow or green to help coaches and players determine how severe the hit was.
It would provide a better idea of whether an athlete needs to sit out for awhile or if he can keep playing. Rogers says athletes on all levels could take advantage of the new technology from little leagues and high schools up through the pros.
MC-10 is working with Reebok on this latest project. They're expected to go on sale in June.