If you waver with the size, you can check the sizing chart below. Please take into account that the measurement on the sizing chart are the measurement from our shoes:
Example:If you are woman and your feet have 24cm long, then, your size in heels would be 38 at least, not 37.If you are man and your feet have 28cm long, then your size would be 43 at least, because 42 has the same measurement than your feet, it means that your toes will touch the top of the shoes and that can hurt you after a while of use.
Place a sheet of paper on the floor, touching the wall. Situate your foot with your heel resting against the wall. Mark vertically on the sheet (you can help with a rule) to where the longest finger reaches (which does not have to be the big toe). Measure the resulting distance