A play in the NFL's wildcard weekend renewed the focus on player helmet safety in football.
The play that everyone is talking about involved Kansas City Chiefs star Quarterback Patrick Mahomes, a helmet-to-helmet hit caused a huge crack and hole in his helmet.
VICIS, the company that makes Mahome's helmet, said in a statement: "While outer shell damage is not ideal, the ZERO2 helmet did its job of protecting Patrick Mahomes during a head-to-head impact during unprecedented cold temperatures."