Love this helmet. They all come in polycarbon fiber-glass material...price can be a couple of hundred. So, how do you decide? The distinction is the "fit"...which you feel not necessarily measure. Off course, the head circumference matters, but if you have ever worn a military issued KEVLAR helmet you know it. You gotta get that perfect calming snug-n-tuck comfortable feel, with this helmet curvitures you have it. There is adjustable quality straps, buckled clips for headlamp, and back side covering the entire basal skull. If you are on the rocks, boulder, climbing, hiking, heck surfing...this will do just fine. It's light weight and feels like a solid hard steel hat. I easily reckon a decent pendular or direct force impact to the head would get absorbed qualitatively by the ridges inside this helmet, good fixed padding, would reduce the force before it shifts to the skull. The back side has curved bulging out border, which would reduce any stress impact towards the cervical and thoracic alignments. It's made in Finland. I have the Pitzl headlamp attached to it, it fits like a Hawaian charm...perfectly! Buy it.