Fits one full size too large

I ordered a size US 10. I fit between a 9.5 and a 10 for most shoes (Nike, Vans, New Balance). I popped on a 10 for these and it felt at least like an 11. Im not quite 10in when I measure my feet with a ruler, but I’m close enough that shoes this size shouldn’t flop off my feet. Probably doesn’t help that she’s don’t have any kind of strap or tie for tightening. I’m exchanging these for a US 9.5, but I’m not convinced they’ll be much better. However, there is no size 9 and 8.5 seems much too small. Wish me luck. I’ll update with photos if the 9.5 fits well enough.

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