Our adult helmets come in one size at the moment: typically 52~58cm/20.47-22.83inch. Kids helmets fit around 48.5cm- 52cm/19.1-20.5inch.
Sawako helmet has a dial-to-fit size adjuster at the back which should make the helmet fit you snugly (here is how to use it).
To measure your head circumference, place a cloth tape measure in the center of your forehead, measure all the around your head as per diagram below.
If you feel you need extra padding, please contact firstname.lastname@example.org.