From LiMaWiki

Protection allows a character to reduce the damage they receive. Each group of armor can be worn with no problems as long as the the character is trained in the appropriate armor skill. Base armor in geomancy is relatively the way the piece of armor is crafted or made as well as general style. The armor itself provides no reducing value. The hardness of the item is determined by the material it is made of.

Each group also provides a Dodge bonus whenever they wear the armor. Light armor provides a +3 dodge, medium a +2, and heavy a +1. This bonus is only applied if the character is trained in the armor type. The dodge bonus increases by +1 at levels 10, 20, 30, 40, and 50 of each armor type skill.

Ex: Jon has a light armor skill of 11. Whenever he wears light armor, he has a dodge bonus of +4. Chrissi has medium and light armor skills of 12, and 5 but she equips a heavy armor which she isn't trained in. She doesn't gain a bonus to dodge while wearing the heavy armor but she would have a +2 to dodge if she wore medium armor and a +3 if she wore light armor.

[edit] Light Armor

[edit] Medium Armor

[edit] Heavy Armor

[edit] Shields