There are five kinds of armour - shields, leggings, armlets, helmets and mail.
Armour can be fashioned from seven different materials, though Leather and Wood won't
be seen too much after the first two or three hours of the game. Each material has a
modifier which is applied to the armour's base statistic. For example, if you have
a Buckler made of Wood, its total INT statistic will be the base statistic (3) plus
the INT modifier for Wood (+6) for a total of 9.
You can upgrade your armour by means of Combinations, just like weapons. Don't
bother with getting the Dread equipment, though - the Jazeraint stuff is almost as good
in terms of STR and better in terms of INT, and takes less time to make (since you need
two sets of Jazeraint stuff in order to make one set of Dread stuff).