Width or Shoe Width
The width of a shoe is measured in letters such as AAA, AA, A, B, C, D, E, EE, EEE, and EEEE, 4A, 3A, 2A, A, B, C, D, E, 2E, 3E, 4E, 5E, and 6E, or N (narrow), M (medium) or R (regular), W (wide). These letters refer to the width of the shoe as measured at the ball of the foot.