It all depends on if you plan on buying boots with Thermoflex liners. Thermoflex liners, which would come standard in the Deeluxe boots that Bomber sells, can accomodate almost up to a cm in foot size. So, if your left foot measures 25.5 centimeters long and your right foot measures 25.8 cm, go with the 25mp boots. Altough I am in a 24mp boot, technically, I should be in a 23mp boot because my foot measures 23.5 cm long.
Not to be a pain, but I disagree with this statement. Your mondo point IS you cm, or vise versa.