I use a pair of pads made by orvis,found them in the discount bin at Flyfishers Paradise many years ago. And they were priced to go too. After the first pair of waders lost the knee in them,and a series of well or not so well placed rocks to the knees I decided to start looking for them. On brookie streams I'm on my knees more often than not so it seemed like a good idea,they do tend to move around more than I'd like but I'm in construction ( renovation) and knee pads are a friend to me ( older knees, tore my knee up playing soccer,then later helped that along jumping in the 82nd). Do they save your waders and knees wear and tear? yes. Are they a pita sometimes? yep. They sure are comfy when they stay put. Whatever kind,style you get consider how well the material they are made of will dry out and how getting wet and drying out over and over will effect them.