Some of the current designs of athletic shoes are offering a “heel offset” feature to appeal to “pronators”. What this means is that the heel is positioned into inversion. Although it is a logical feature to offer, the degree of positioning can be rather large.  An 8mm offset can translate to 10 degrees or more of heel inversion.  From an orthotic perspective, 8mm is generally an extreme degree of positioning.  With that said, it is important to consult with your health care professional prior to purchasing a shoe with an “offset” heel.  If you are wearing orthoses, it is usually best to wear a neutral athletic shoe to maintain the accuracy of the orthoses’ position.