What he said, although whilst I do many stupid and dangerous things, mountain bike riding is not one of them. Literally everyone I know gets ruined doing it eventually.I rode without a helmet for a long time and made the switch to set a better example for my boys. Also I spend way too much time in the glades to not be wearing one. Just makes logical sense. I wear one mountain biking so why wouldn’t I on a snowboard. The added benefit of a helmet is better wind protection and I can use it to deflect thin branches that are in my way at should height.