While driving my vehicle at highway speed (75mph), the driver's seat headrest, for lack of a more descriptive term, exploded and struck me in the back of my head. After the incident I stopped the vehicle and looked at the headrest. It appears to be spring loaded and something in the headrest failed causing it to spring forward for no reason. The headrest is now compressed and held in place with zip ties until I can find a replacement. I feel this is a safety issue due to the disorientation and headache that immediately followed the incident.