If your head circumference is right on 60cm, IMO I would be leaning toward the large, given the Size Large is (60-62cm)Wooo great breakdown!
The boa built into the helmet is really nice touch
I want to order the logan, the only thing that makes me want to get the Merak is the adjustable vents, Ill have to decide sooner or later!
My measurement is smack between med and large, you would suggest to go large right ?
@mjayvee 's fit experience and mine seem to coincide, only needing a few clicks on the Boa dial
YMMV somewhat with head shape, but maybe not radically(???)
I take it you are far away from a bricks and mortar store that stocks them?