I've got one and it did help me. Then hubby knicked it! As Swerve says achilles is a nightmare to shift, if you're lucky enough to shift it at all. So take heed, try to allow it to heal, calm right down, and then even when it is calm give it some more time - like another month before resuming. I didn't as simply did not appreciate how awful it could become and have had achilles trouble since 2005. Mine is now swollen and only fixable through surgery. But surgery is risky, not very successful and could leave me unable to run at all. I guess I'm trying to say take heed, especially if you have stiffness in the morning, pain that comes on during a run. Or when moving about but seizes up when you stop. Best of luck. I've got temporary relief through cortisone, which I hope may give permanent relief, but I doubt it somehow. Still am enjoying running for now... So I wish you the best of luck ,use the sock and guard it well....!