Quick answer
Start with the length of your longer foot in centimetres. If your feet measure 26.5 cm and 27.0 cm, a Mondopoint 27 is a starting size. Check the brand’s size guide and try the shell fit when possible.
Formula and assumptions
Mondopoint corresponds approximately to foot length in centimetres. Confirm the manufacturer’s sizing and shell fit.
Worked example
Feet measuring 26 cm and 26.5 cm suggest an initial Mondopoint estimate of 26.5.