Sizing is OFF, size down.
I bought it for use as a MTB/Urban helmet that would work for Skiing. Because the size chart is so wrong, it looks like it will only get used for skiing (hat underneath makes it fit properly).
My head is 59cm, which makes it hard for me to find helmets that fit well (M too small, L is too large and bulky). The L/XL here is HUGE. Even with the largest pad set (1/2" pads), it wasn't close to fitting properly.