You found a pair of shoes you love. You check the size. And then you see it: a little letter sitting next to the number. AA. B. D. EE. Maybe you've always ignored it. Maybe you've always wondered what it meant. Either way, that little letter has a big impact on how a shoe actually fits—and understanding it might be the thing that finally ends your search for comfortable shoes.
Here's everything you need to know about shoe width letters, explained simply.
Shoe Width Letters: The Quick Reference
Width letters indicate how wide a shoe is across the ball of the foot—the widest part of your foot at the base of the toes. The scale runs from very narrow to very wide, and the letters follow a logical (if a little old-fashioned) system.
| Width Letter | What It Means |
|---|---|
| AAAA | Extra extra narrow — extremely rare, specialty sizing only |
| AAA | Extra narrow — uncommon but available in select brands |
| AA (2A) | Narrow — slimmer than standard, common in women's sizing |
| A | Slightly narrow — narrower than B but wider than AA |
| B | Standard women's width — what most women's shoes are made in |
| C | Slightly wide — less common in women's shoes |
| D | Wide — a common wide width for women |
| E (1E) | Wide to extra wide — more room in the toe box and ball |
| EE (2E) | Extra wide — significantly more volume throughout |
| EEEE (4E) | Extra extra wide — specialty sizing for significant width needs |
A few things worth knowing about how this system works in practice:
• More letters = more extreme. AA is narrower than A. EE is wider than E.
• Numbers work the same way: 2A = AA, 2E = EE. Brands use both interchangeably.
• Women's and men's scales are different. A D width in men's is standard. A D width in women's is wide. Always check the gender designation.
• Not every width is available in every style. Most mass-market brands only offer B (standard). Specialty brands like Marmi offer a true range.
The Two Widths Women Search for Most
Narrow Widths: AA and Below
If you have a narrow or slim foot, you've probably spent years swimming around in shoes that technically fit in length but slip at the heel, gap at the sides, or feel sloppy. That's a width problem—not a size problem. To understand why width matters more than sizing, read our full guide here. Narrow feet need shoes built with a slimmer last (the mold a shoe is built on) that holds the foot snugly rather than letting it slide.
AA (2A) is the most commonly available narrow width and the one most women with slim feet should start with. It's noticeably narrower than a standard B but not as extreme as AAA or AAAA. Not sure if you have narrow feet? Check the 5 signs here.
→ Browse Marmi's Narrow Collection — Built for slim and narrow feet, in styles you actually want to wear.
Wide Widths: D, E, and EE
On the other end of the scale, wide feet need more room across the ball of the foot and a deeper toe box. Wide widths aren't just about comfort—they're about preventing the bunions, pinky toe pain, and blisters that come from squeezing a wide foot into a standard-width shoe for years. Not sure if you have wide feet? Check the 5 signs here.
D width is a common entry point for women who find standard shoes too snug. EE offers significantly more volume and is a good choice for women who have tried D and still find it tight.
→ Browse Marmi's Wide Collection — Real width, real style. Shoes that fit the way they're supposed to.
Why Most Shoes Only Come in One Width
Here's a frustrating truth about the shoe industry: the vast majority of shoes—even expensive ones—are only produced in a single width. For women's shoes, that's almost always B (standard). The reason is purely economic: manufacturing in multiple widths means multiple lasts, more inventory, and more complexity.
The result? Roughly half of women are wearing shoes that don't actually fit their feet. They're sizing up when they should be widening. They're breaking in shoes that were never going to feel good. They're blaming their feet when they should be blaming the shoe.
Width sizing exists to solve this problem. When you shop from a brand that actually offers a meaningful range of widths, you stop compromising.
How to Know Which Width You Are
If you've never been measured for width, the most accurate approach is a proper fitting at a specialty shoe store using a Brannock device—the metal measuring tool you've probably stood on a hundred times without knowing what the width slider actually does.
But there are some signs that point you in the right direction without a formal measurement:
• Your toes feel cramped or overlap — likely wider than B. See all 5 signs you have wide feet.
• Shoes gap at the sides or your heel slips — likely narrower than B. See all 5 signs you have narrow feet.
• You always size up for comfort but the toe area is too long — this is a width issue, not a length issue
• You develop blisters or calluses on the outer edge of your foot — often a sign the shoe is too narrow
• Straps or laces never feel quite right — the underlying shoe structure may not match your foot's proportions
Our full guide to women's shoe widths goes deeper on measuring, fitting, and finding your ideal width—it's worth a read if you want to really nail your fit.
→ Read: The Complete Women's Shoe Width Guide
The Bottom Line
Shoe width letters aren't fine print—they're essential information. AA through EE is the difference between a shoe that fits and a shoe that just sort of fits. Once you know your width, shopping becomes a different experience entirely: you stop buying shoes hoping they'll stretch, and you start buying shoes that feel right from the first wear.
→ Shop All Widths at Marmi — Narrow, standard, and wide, in styles made to last.