Design Philosophy Ride it all. The Hummvee Plus Helmet is at home on trails, mean-city streets and everywhere in between. Incorporates the MIPS® Brain Protection System which is designed to reduce rotational motion transferred to the brain from angled impacts to the head. MIPS® MIPS® Brain Protection System which is designed to reduce rotational motion transferred to the brain from angled impacts to the head. Airflow An MTB helmet that’s been designed with airflow in mind, the large vents maintain a linear flow of air to maximise breathability and comfort. Helmet Crash Replacement Scheme If you’re unfortunate enough to be involved in an accident that causes damage to your Endura helmet, our Helmet Crash Replacement Scheme will reduce the cost of replacing your helmet with the same model or nearest model.