I really like these socks so far, they do keep your feet more stable both on the reformer and tower. I do a lot of pilates and like the supportive fit. I'm a 10.5 shoe size and they fit fine. One caveat is that I only just got them, so we'll see how they hold up with repeated washings and how long the grip lasts. I don't ever put my grip socks in the dryer, but I find over time, other brands have stopped working as well. For the price these need to hold up!