
I wear a US 9 women's shoe. I ordered the Large, and it fits properly and works. Because it's so tight, it can get annoying, so I take it off after a few hours. It has helped my pain a lot. I plan to continue wearing it on and off a few hours a day, whenever I think of it or feel like doing it, day or night, walking or at rest. It's durable and washes up well. It fits easily under a sock. I have no complaints at all, but can't vouch for how well it works or lasts over time because I've only had it a short while. That's why I gave it 4 stars instead of 5. FYI, if I had bought the Medium, it would have been so tight I wouldn't have been able to pull it on or have been able to stand it. And FYI, wearing it to bed in the winter, it makes my toes cold, so I wear a bed sock over it.

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