I'm buying my second pair because after all they're great shoes that have been worn every day for 2 years now. Comfortable, breathable, easy to put on. But maybe also something easy to slip through; the closure is the bottom of the shoe. The surface is rough but otherwise smooth. It's soft, which gives it good rebound, but that also means it wears out. The bumps that give you some traction get flatter and quite slippery over time. Just understand what you are buying; something like a tire that sooner or later wears out and needs to be replaced. There's nothing wrong with shoes, it's just the nature of soft rubber.