The arch support is so much that you DO feel it when you wear these shoes.  I definitely feel these shoes are helping my feet.  I was recently diagnosed with heel spur syndrome/plantar fascitis and I've been trying all sorts of things out including reducing my high-heel shoe use and putting good inserts in my other shoes.  I pretty much use these flip flops around the house as "house shoes" since it's been cold out.  I would definitely recommend these as part of a "treatment" process.