Poor quality zippers. I've gone through a couple of pairs now and for some reason the zippers eventually want to go down. It's too bad because they fit and feel good. They're very flattering. After inspecting the sewing, they're not all that well made either. I've never had them rip on me but there were a lot of threads sticking out of the seams when they were brand-new. That can be fixed with a quick snip. The zippers however need to be improved.