I already know that;-) My head circumference is 57 and I'm interested in the Abus In-Vizz Ascent (54 - 58 cm) and/or the Abus Hyban+ (52 - 58 cm). But if I can't try them on or have a return option, I'll have to look for another dealer.

If this is the case, I recommend that you try on and buy the helmet at the "Athletic..." sports shop.

https://www.athleticum.ch/de...

Measure the circumference of your head with a tape measure. If it is between 54 - 58 cm then it fits. In the link you will find instructions on how to do it and what to look for when buying a helmet.

https://www.bergzeit.de/magazin...