Literally just a rugby scrum cap put on top of helmet....
The helmet and pads aren't helping shit, they make players believe they're protected but the damage is from your brain hitting the inside of your skull.
The cap isn't even used in rugby to prevent concussions, and even have a label that says they're not meant to prevent concussions. It's just a little outside padding to keep your ears on and prevent massive goose eggs.
The helmet and pads aren't helping shit, they make players believe they're protected but the damage is from your brain hitting the inside of your skull.
It's effectively a crumple zone for your skull - it's increasing the time of impact, reducing the jolt and therefore the impact of your brain against the inside of your skull.
To be clear, no I don't think they're wildly effective, but they definitely do something.
Brain injuries are an existential threat to the NFL. They're going to jump on anything to cut it down as long as it isn't changing the game or shutting down operations.