September 9 people found the following review helpful. DMX FlowPak just a mass of air under my feet. By M. Kelly I've worn Rockport ProWalkers least ten years. A week ago I bought the new ProWalker astride the FlowPak DMX technology. As I felt good in the store, after using them for a few hours my feet started to hurt in the FlowPak DMX is (just below the toes). I used these shoes for a week and continue to hurt the feet. This "revolutionary" FlowPak DMX is just an air pocket in the sole of the shoe. Anything about it "flows" when walking. These are the most ProWalkers uncomforable I've had. I will try to return these shoes, but my shoe store has a no return policy. I contacted customer service Rockport. Let's see what kind of response I get.