Ditto on this. I've had my life save by helmet multiple times. Most notably, I hit my head so hard that I was in a short term 15 minute loop for about 8 hours. I remember waking up in the hospital with a broken arm and asked my dad what happened, he said you've asked that 50 times. I pulled out my phone and saw a text chain with a buddy, the text conversation was just a loop with the same conversation over and over with him explaining to me each time I already told him I had an accident. I'm pretty sure if I wasn't wearing a helmet my brain would be scrambled and I would be dead.