True! I had a beater pair of Cyber Mondays I used for work and though the upper still had lots of life left, the sole was badly damaged from wear & tear. No holes or anything but the outsole became super thin. To the point where I could feel the air bag near the balls of my feet flopping around from time to time. I took off my shoe and it was super lumpy and thin on the outsole. They were officially cooked. That shoe was only 2 years old. I only wore the shoe for half a year everyday when i would go to work.