Ken I am 27, athletic, and in great shape, but my flat feet coupled with all my activity has caused me to already experience knee problems, including two surgeries and months of physical therapy. My doctor prescribed custom orthotics, but they were so heavy and didn't fit well in all my shoes. My physical therapist told me this was an issue I had to solve, and recommended a popular "name brand" arch support, but I could never comfortably fit into one, and I could never trim the support down to the appropriate size for each pair of shoes I own, plus they never really seemed to work for me. I stumbled across Good Feet by accident one day searching through Google and thought, "Well, this is my last option." The store associates were increcibly knowledgeable and helpful, despite my skepticism and caution. The price really threw me for a loop at first, but they pointed out the lifetime warranty, and the two other customers in the store also started bragging about how great it was. Mathematically I figured after 2-2.5 years of owning them, it would be the equivalent of buying other "name brand" arch supports every 5-6 months. I've had Good Feet now for about 3 weeks and telling everyone I know how much I love them is an understatement. I swear by Good Feet, and I can honestly say it is the only thing that has worked extremely well for me. I can easily change them from shoe to shoe, never have to worry about trimming, and I can literally feel a huge difference in how I walk, and how my body responds to activity. This is definitely an investment I think everyone should make, and can guarantee it will pay off.