While they really do work (heels are far less cracked after a week's wear), I seem to be allergic to the material used. The tops of my ankles bear an uncomfortable, itchy rash. They're so effective, I think I may try to cover the top of the ankle with bandaids in order to continue use without the rash.
I like them. They serve the purpose. Note the wider opening is for the toes, not the ankle. Although stretchy, they can hug your ankle. I don't feel, however, they cut off circulation. They add comfort to the heel. They work well with sandals. Adjusting from time to time is necessary if you're active. Walking will cause them to move, like a sock. All-in-all a decent purchase. I need the buffer while my heels heal. Thanks Groupon!