I am unfortunately turning out to be a ‘tester’ for safety equipment in karting. I have had several ‘incidents’ since I got into this sport 6 years ago. Many more than the ‘average’ karter. I had a foam collar when I flipped the first time, breaking my collarbone and 3 ribs on the right side, along with collapsing my lung. I went to a Leatt after that. I was wearing my Leatt when I flipped last May at ORP. No major injuries. No neck injuries in any of the other ‘incidents’. Here’s a couple of the more recent ones:
https://vimeo.com/57266997
https://vimeo.com/71629310