How to measure your foot:

For best results in finding your size we recommend measuring both feet, heel to toe:
Standing with your heels against a flat wall

1. Slide ruler under each foot
2. Be sure to measure the end of the longest toe
3. Take the longer of the two measurements

If your foot length varies by more than 0.4cm, it will be difficult to get a precise fit for both feet.
If your second toe is more than 0.4cm longer than your big toe it will be difficult to get a precise fit.

The KSO and Flow offers a slightly larger fit, as such if you are just over your size - stick with the smaller size. With all other models, opt for the larger size.