Shop for shoes when your feet are at their largest – at the end of the day or after exercise. Get your feet measured every time you buy shoes – it is common for one foot to be larger than the other, and your foot size and shape can change as you age. If you play a sport, choose a shoe designed for that sport.

The model number (or SKU) of a shoe can be found on a label located on the inside of the shoe tongue. RN stands for registered identification number. It is a number assigned by the FTC to US businesses that manufacture, import, distribute or sell products covered by the textile, wool and fur Acts.