An insole measurement is the length and width of the inside of a shoe at the points that are the greatest distance from one another. The length of an insole measurement is found by measuring the inside of a shoe from the toe to the heel while the width is measured at the shoe's widest point.
Accurate insole measurements are vital for selecting the correct shoe size. Shoppers need to measure the length and width of their feet and compare the figures to a company's insole measurements to determine what size shoe they require. They must also take into account the thickness of any socks or accessories that they will be wearing with the footwear.