I develop bad calluses, too. I use to stuff my shoes with cotton before every workout before I learned some shoes are better than others. Toe and heel box construction is critical and no two models are the same. Many serious walkers/runners, once they find a great shoe, will buy up multiple pairs because manufacturers frequently change construction on even their most popular models. The model I currently wear was discontinued a couple years ago but, luckily, I can still find them. For people like me who go through a pair of shoes every six months, buying slightly used and display models on ebay allow for testing lots of shoes, cheaply.
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