I wear a size 11 shoe and was concerned these socks wouldn't fit well but they have just enough stretch that they did!
I use it everyday even when im not doing yoga.
As a beginner I really enjoy this product because it helps me stay in balance. Only problem I have that the open toes are too small for my toes because I have a wide foot. Other than that it's a great product
Overall, these socks do what they claim and I definitely use them in practice. However, this "one size fits all" sock sizing doesn't work for everyone; for those of us ladies who have larger feet (I wear size 11 shoes), it requires the material to stretch much more than someone with smaller feet, and the textured grip on the bottom gets pulled out of shape a bit. I.e. the ankle grip isn't in the right place, there are parts of your sole without coverage...it's just not ideal. They could easily provide the same type of sizing as normal socks; a "regular" (up through ~shoe size 9) and an "extended" or large options (9-12).