Of course size matters! Choosing the right shoe size is really important, because nobody wants to feel cramped in a pair of sneakers that are too small, do they? Ill-fitting shoes can be very unpleasant. Studies show that up to 72 percent of people wear the wrong shoe size, which is associated with foot pain and foot conditions. To find your optimal shoe size, you can compare sizes with a size chart. Most brands follow the standard sizes below, but it's always worth checking the manufacturer's own website as well. If you are in between sizes, you can always consider ordering half a size larger.