Size Measurement (cm) Measurement (inches)
Small 51–55 cm 20.08–21.65"
Medium 55–59 cm 21.65–23.23"
Large 59–63 cm 23.23–24.8"

If you are on the edge between sizes after taking 3 measurements, we suggest sizing down. The A2 will break in similar to a ski/snowboard boot and can be tuned to your liking.