The Bell Tracker Helmet stands out from other protective MTB and cycling headwear on the market thanks to the Ergo Fit System and its easy-to-use dial. This dial no longer requires a push to turn it like the one on the old ErgoDial version, and it is more sleek and less bulky.The impact EPS foam, homing in on certain zones of the head to protect and cushion it from impact, bonds with the helmet's outer shell to create an overall sturdier helmet. Bell Tracker Helmet | Millets