I have walked on nothing but flat surfaces carpet asphalt and tile, and tile only got to wear 3 or 4 times. 270.00 shoe deflated while I was standing in Dillards looking at suits. I have never been more careful with any shoe I have ever had. This was my dream shoe. It appears to have a weak seam going around the pocket of air. There is no visual hole anywhere in shoe it made me so sick to my stomach when it happened I almost threw up in the middle of Dillard's.