Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor leather quality

I've worn these shoes for years. A few years back one pair cracked after a few weeks. Thinking this was just a fluke I continued to buy them. Within the last 6 months though I've gone through 3 pairs, all of which have cracked on me. The leather either bubbles, feels as if there is gravel behind it or, as on one pair, there is nothing behind the leather. I have bought my last pair of skechers.