shoes, as well as sizes of different types of shoes, can be compared directly. This is used with the Mondopoint system (USSR/Russia and East Asia). Size 0 as the length of the shoe's inner cavity of 0. The shoe size is then directly proportional to the inner length of the shoe. This is used with systems that also take the measurement from the shoe. While sizes of children's, men's and women's shoes can be compared directly, this is not necessarily true for different types of shoes that require a different amount of "wiggle room" in the toe box. This is used with the Continental European system. Size 0 (or 1) can just be simply a shoe of a given length. Typically, this will be the shortest length deemed practical; but this can be different for children's, teenagers', men's, and women's shoes - making it impossible to compare sizes. For example, a women's shoe at size 8 is a different length from a men's shoe at size 8 in the US system, but not the British. Width Some systems also include the width of a foot (or the girth of a shoe last), but do so in a variety of ways: Measured foot width in millimetres (mm) - this is done with the Mondopoint system. Measured width as a letter (or combination of letters), which is taken from a table (indexed to length and width/girth) or just assigned on an ad-hoc basis. Examples are (each starting with the narrowest width): AAA, AA, A, B, C, D, E, EE, EEE is the typical North American system and follows the brannock device standards, per the system B is narrow, C is regular, D is medium, E is wide, EE is extra wide and so on. 4A, 3A, 2A, A, B, C, D, E, 2E, 3E, 4E, 5E, 6E (variant North American). In Japanese Mondopoint system the unlettered D size is the norm for men and B for women in its foot circumference. C, D, E, F, G, H (common UK; "medium" is usually F but varies by manufacturer—makers Edward Green and Crockett & Jones, among others, use E instead, but one maker's E is not necessarily the same size as another's). N (narrow), M (medium) or R (regular), W (wide). The width for which these sizes are suitable can vary significantly between manufacturers. The A–E width indicators used by most American, Canadian, and