Tennis shoes are designed with a particular purpose. I have Lotto Raptor and will get Babolat SFX shoes next week, both of them with a unique design. So, do adding special insoles like Spenco, Cadence or Superfeet alter the shoes original design in a negative way? That is, one is adding an external insole that was not part of the original design of the shoe. Many people like me will think that insoles are for the better but could it be the opposite?:-?