Start by speaking to a trained shoe consultant about your running surface and running style.
Surface & Purpose
Road running, trail running, training or racing?
What kind of feet (and therefore foot strike) do you have? See chart below.
Current Training Programme or Running Regime
Consider how often you train, how far you run and how long this takes, plus your performance level.
Measure in the afternoon because your feet may swell during the day and impact the fit of your shoes.