The 2040 is a single E width Munson style last. The Munson last was developed for military use by analyzing x-rays of the human foot and adopting a more anatomically shaped toe box. From above the Munson last appears flatter on the medial side of the foot and rounder on the lateral. Our 2040 has a low heel and narrow waist with a slight bump in the toe. The 2040 is a great option for those who appreciate the fit of the 2030, but prefer a more traditional boot shape.