The only protection a helmet is going to provide is from flying debris. If you roll a Slingshot and the hoops fail, you are likely dead.... with or without a helmet. Personally, I think wearing a helmet in one of these defeats much of the purpose of the vehicle. If part of the fun is the open air feeling, the helmet is just going to detract from that. Would be better to have a low slung open top sports car if the open air vibe is what you are after. An open face helmet returns the "open air" feeling for the most part but then exposes you to the greatest risk once again: debris. I'd much rather have a taller rigid-framed polycarbonate windshield and ditch the helmet. Ditching the helmet without a taller windshield (the stock one looks low enough to expose you too much) in something this low to the ground is likely asking for eventually catching a rock to the forehead. That happening at highway speeds would be big trouble. I caught a bumble bee to the forehead at about 75 mph (no helmet faceshield) on a motorcycle once. I almost crashed. I cannot imagine taking a rock at that speed... especially since a rock flung off a tire from a vehicle in front of you is going to have it's own velocity so the speed at which that thing whacks you in the face could potentially be upwards of 100 mph.