Okay, so last Tuesday, I was scrolling through this fancy online shoe store, right? Saw these killer boots that looked perfect. Clicked on my usual size – nothing. Zero stock. Panic mode hit. Then, I spotted a pair labeled 37AA. My brain just froze. “37AA? What kinda alien sizing is this?” Seriously, I’d never seen that double-A thing before. Grabbed my laptop, plonked down on the couch, and dove into the rabbit hole.

The Confusing Starting Point
First thing I did? Grabbed every damn shoe in my closet. Checked the tags inside. Found US sizes, UK sizes, even some random numbers with ‘EUR’ scribbled. But no AA anywhere. Felt like I was missing some secret shoe club code. Pulled up Google and typed “what is shoe size 37AA”. Got pages about European sizes, width charts… info overload city. My eyes glazed over. Needed something simple.
Breaking It Down
Took a breath and attacked it piece by piece. Remembered that number 37 usually means European sizing. Measured my foot length with a ruler – around 23.5 centimeters. Checked a Euro conversion chart online. Yup, 23.5cm equals size 37. Okay, so that part made sense. But the AA? That bugged me.
Dug deeper. Found out some brands add letters after the number for width:
- AA is super narrow
- B is medium/standard
- D or E means wide
Mind blown. All these years, I’d only seen numbers! Turns out, my feet are pretty narrow – explains why some shoes felt like boats. AA width is for skinny feet, like proper pencil-thin.

The Lightbulb Moment
So, putting it together: 37AA means:
- European size 37 (about a US women’s 6.5-ish)
- With an extremely narrow width (AA)
Felt stupid for not knowing sooner. But hey, how often do you see AA stamped on shoes? Rarely, unless you’re hunting specific brands or have slim feet.
Testing the Theory
Couldn’t just trust the internet, right? Drove to this fancy boutique downtown known for precise fittings. Walked in, asked for a 37AA tester shoe. The sales lady nodded like I’d spoken the secret password. Tried it on. Wow. Snug but not crushing. Like the shoe hugged my foot sideways too, not just length. Felt amazing. That’s when it clicked – the AA width matters big time if your feet are narrow. Changed my whole shoe game.
Honestly? Felt kinda smug walking out. Started eyeballing every shoe tag after that. Size 37AA ain’t some mystery code – just a precise fit for narrow feet. Still salty about those sold-out boots, though. Lesson learned: now I search by width too.