Nike / running shoe
I have never seen this happen with any pair of tennis shoe I've ever owned. Yes, the shoes are fairly old but they are very lightly worn only worn on rare occasions and stored indoors. I decided to go back to the gym, pulled the shoes out wore them to the gym then next day wore them to walk my dogs... got about a mile in and one sole started flopping so much so I had to tear it completely off then limp all the way home on uneven shoes! When I got home I inspected the other shoe and found it was about to do the same thing. Very poor quality product. Highly disappointed.