What do the different armor types do?

From http://www.indiefaqs.com/index.php/Droid_Assault_Guide, I could find 5 types of armor. They are

  • None
  • Kevlar
  • Plasteel
  • Titanium
  • Nanomesh

Looking online, it seems that the armor is just for show and does not affect the gameplay (It doesn't count towards a health bonus), but I couldn't find a source saying that explicitly.