Armor type of druids on WOW?
Cloth and Leather. That's it.
Base form is Leather, but all 3 trees can increase your base
armor:
Balance: You'll likely be moonkin after level 40, which makes
you more like a shaman, but with a mage's dps. Moonkin shifts your
armor up to the likes of mail.
Bear Form: Level 10, increases armor to the value of mail and
stamina slightly, making you like a warrior with warrior related
spells.
Dire Bear Form: Level 40, moves your armor up to plate value,
and increases your stamina greatly. Fantastic for tanking.
Tree of Life/Travel Forms, and your regular form: Restoration
grants a talent that boosts your armor in between leather and mail,
but close to mail and your travel form and regular form the same
way.
Cat Form: This form keeps the same armor, so its like the rogue,
armor and everything.
Order of Armor Value:
Cat Form; Leather (rogue armor)
Travel Form and normal Form; less then Mail, more then
leather.
Tree of Life Form; slightly less then mail. (near shaman)
Moonkin Form; Mail (shaman)
Bear Form; Mail (low level warrior)
Dire Bear Form; Plate (High level warrior)