Treat this as a guide only. Conversion between different systems is not exact. Sizing, length-to-width ratio and other dimensions vary by brand, shoe style and designated width fitting. See below for more information.
Letterings such as W, XE, B, D, 3E, 5E etc displayed next to sizes are width fittings. These are shown for only some items in the store. To give some examples: B is narrow for a men's shoe, standard for a women's shoe; D is medium for a men's shoe, wide for a women's shoe; W is wide; XW is extra-wide; and 3E, 5E etc indicate varying degrees of extra width. We welcome your inquiry if you need clarification.