Concussions are no joke man, in any sport that requires contact, or the possibility of impact, athletes always stay vigilant on concussions. Personally, as a cyclist whose had one before, I get very paranoid every time I get on a bike, or others around me go for a ride. Luckily, we can all stay better protected, and more aware of any injury. Reebok and mc10 have collaborated to create CheckLight, a head impact indicator meant to make it easy to see when an athlete has taken a dangerous blow to the head. The CheckLight is composed of two parts: a sensor device built by mc10 and skull-cap made by Reebok.