Amazon has a great bit of Gender going on if you're trying to find boots
You might think you pick Men's or Women's and a size, but no!
The sizes themselves are gendered, you have to pick size Mens-10 or size Womens-12, which is separate from the gender option

@foone I have a question.. are shoe sizes non gendered elsewhere?

Australia, UK and seemingly US (at least from the conversion chart I had working selling shoes sometimes in a department store)

all i remember is genders and wondering why.

@LottieVixen No, this is a common thing in the shoe industry, from what I've sen. Amazon's filtering implementation just makes it very obvious
@LottieVixen @foone afaik continental Europe shoe size is not gendered
@obfusk @LottieVixen I'll have to import some of these european genderless shoes
@obfusk @LottieVixen @foone it's not, because it's just a direct measurement of foot length. But width sometimes will be (since that isn't standardised the same way)
@swift @obfusk @LottieVixen That makes exactly the amount of sense I expect, good to know

@swift @obfusk @foone well.. fuck I'm glad I asked because I'm learning stuff :D

but also aa it's annoyingly complicated

@LottieVixen @foone Picking the first size chart in search results, UK shoe sizes don't appear to be gendered (the charts are gendered but that just seems to change the range of available sizes; they convert to the same European size).

That said, the default width is still typically gendered.