This Helmet is Pretty Awesome. The Sizing is Correct. My head is 57 Centimeters. And the Medium Fits Perfect!
It's super lightweight, the vents can be opened or plugged with the included foam pieces. The padding is just right, and the ear pads are comfy! I have a Bern Brentwood and R.E.D. Synth and I choose this helmet over both of those!