My daughter has always had foot odor problems.  It is so bad that you can smell it through the entire house sometimes.  I accepted that it is something we had to live with because nothing I tried worked to resolve it. I bought 2 pairs of these socks and after a week, I noticed that her feet didn't smell as bad.  I decided to replace all of her socks with these.  Now, her feet don't smell at all.  This is even after days when she forgets to wear the socks.