I bought a pair of the Spenco Polysorb Proform Insoles over 18 months ago with a one-year replacement gaurantee. No need to use it, they are still as springy and supportive as the day I bought them. I work out (high-impact circuit training) nearly everyday and have run a few hundred miles in them. After all this time, NO ODOR! I have a VERY high arch and these are hands-down the best insoles I have ever had. If these ever wear out, I will definitely buy another pair.
Miranda