The NFL, NCAA, High School, and youth leagues use the standard helmet, which ranges in brand and design, to serve one ultimate purpose to lessen, not entirely prevent the event of brain trauma and the proceeding effects.
When athletes suffer a head injury after recently receiving a concussion without adequate time to recover. This does include repeated concussions, sub concussive impacts, and symptomatic concussions. The brain swells immensely and can hemorrhage, needing immediate medical