my head measures 59.5 centimeters which is .5 cm to big for the large bern helmet so should i go with the xl or what? my boeri helmet is just a large and it fits fine; it says large 58-59 cm.
go large, because the helmet is meant to fit heads from 57 to 59, and yours seems to be a 58-59, and it would fit loose on a 57, but nicely on you...go L