This helmet had the most secure and comfortable fit I have ever experienced. The Up and Down retention system really does live up to everything Kask says. I had absolutely no problem finding a perfect fit. Also, the quality of the helmet itself was some of the best I have every experienced.
BUT! There seems to be a glaring flaw with the retention systems design depending on your head size and sunglass choice. Of all my sunglasses that I tried *No-Name brand, Oakley, Smith* NOT A SINGLE ONE fit with this helmets retention system. The Up and Down comes quite low on the back of your head and as a result the ear stems clashed every single time. I was either forced to shove the stems under the retention and pinch my head or stretch them very far over where they then refused to move with my face.