So, the Kortal has arrived. It’s the medium large size, so 55-58. My head is at the top of that sizing but the helmet fits well. With the retention system at the lowest setting there’s still a good few clicks of adjustment on the wheel at the back to tighten. Fit wise, it’s definitely lower on the head than my Troy Lee A2, noticeably deeper coverage around the temples and back of the head. My Oakley Jawbones fit completely fine with the helmet, either over or under the straps. It’s a comfy helmet, but is a narrower fit than the Troy Lee. I have a narrowish head and wouldn’t want it any narrower really. I’ve got a Tectal Race Spin coming tomorrow so will compare with that and decide which to keep.