If your heel is slipping or if your foot is moving around while running, this tip might be all you need to fix your problem! Tying your shoes using a heel lock can “lock” your heel into place keeping it from slipping and moving around. Also, if you experience blisters while running, it may be due to your foot sliding around inside your shoe. Using the heel lock can sometimes help this problem and eliminate your blisters too. Give it a shot and let me know if it helped you!