The basic shoe size is recorded in the first 2 digits.
Followed by 0 for standard width;
1 for a slightly wider fitting;
2 for extra wide;
9 for an extra-narrow fitting.
For example: 430 is a size 43 shoe of standard width; 439 is a size 43 shoe of extra-narrow width.
If your feet are standard width, place a 0 after your shoe size. Note that stock levels and availability are always highest for standard-width shoes