S...
Review confirmed by purchase 
56-60 cm according to the description, 57-61 cm according to the box. In the package, there is a plastic shell and foams attached with double-sided tape that you have to stick yourself, it's a bit tricky to do it evenly. On my head, with a 57 cm circumference after attaching the foam, the helmet still moves around like a pot. Someone was selling a similar one on OLX, reason: too big. It's a pity because for this price the quality and design are satisfactory. The chin strap is indeed a bit tight and not very comfortable. I will probably try to make it even smaller somehow. For this price, I think it's worth buying, but be prepared for some minor modifications.
