Over my lifetime riding bikes I have witnessed two major crashes where both non helmeted victims survived with life changing traumatic brain injuries.<p>One fell off a low bridge and the other was riding causally along and somehow ended up going over the bars and hitting her head on the curb.<p>Seeing just one of these was all the reason I needed to never ride without a helmet.<p>I wear a couple types depending on what sort of riding I&#x27;m doing (mountain, road, racing) they are MIPS equipped when ever available.