For anyone who has never heard of the Q Collar I'm copy pasting a google summary with a tiny bit of trimming. My first uninformed thought is, "OMG that sounds insane"

" Q-Collar is a C-shaped, non-invasive silicone neck band designed to help protect athletes' brains from repetitive sub-concussive impacts. It is worn during high-impact contact sports like American football, soccer, lacrosse, and hockey.

How It Works -

Jugular Compression: The band applies light, safe pressure to the sides of the user's jugular veins.

Increased Blood Volume: This mild pressure slightly slows blood outflow from the head, increasing blood volume in the venous structures surrounding the brain.

Reduced Brain "Slosh": The extra blood acts like an internal cushion or seatbelt, minimizing the movement (sloshing) of the brain inside the skull during an impact. "