Unlike shoes, the question is difficult to answer with fins because a 'shoe' size is only part of the answer. The brand and type of neoprene bootie you wear, particularly if you wear heavy soled or rock boots, will have as much effect on the selection of fin foot pocket as the shoe size. Some people, especially those with high arches, prefer a loose fit in their fin and others prefer a snug fit. Fitting drysuit boots in the very large sizes is especially problematic.
There is no size standardization between brands of fins (or even between different models from the same brand) and so you cannot assume that a size in one brand of fin is the same dimensions as the size in another brand; even when the designs look very similar. Taking some actual measurements of your boot while on your foot and comparing to our foot pocket dimension charts will help determine the size selection for your desired fit.
Determine your correct size before you order! If you are not certain about your fin size then our recommendation is not to order until you can obtain that information. While Dive Gear Express will accept fins for return, you will be responsible for return shipping costs. Return shipping costs on fins can be expensive (especially from an International location) because fins are a relatively low priced item that has a high 'dimensional weight'. Your complete satisfaction is our goal, so please consider carefully before purchase.