It is the 4th pair that I buy in 9 years. With an average lifespan of 2 and a half to 3 years. Some lasted 4 years, others 2 years. I bought the first 3 pairs from a physical store. The 4th pair, which I bought just 10 days ago, I got from an online store. I don't know if it's a coincidence, but the last pair has a defect. Specifically, in the right sole, the 2 rubber parts that embrace the heel do not form the correct angle. They have some flaw and it looks strange. I didn't bother contacting the store, as it's not such a critical product.