Personal Shields: Personal Shield or PS cover your whole body in an invisible web that can block bullets and melee attack, and in extreme cases the stronger ones have been know to block a bomb going off.
Combat shields: Melee shields are glove slides over one of you hands and then when actived creates a three inch thick shield the shape can be altered to be anything form a tower shield to a buckler, depending on the storing crystal the color can be changed as well. They are made for blocking Melee attacks but can be changed to block gun fire.
Giant Power Shields: GPS are used to guard ships and bases they can block anything that is not set on the same frequency as them, the best tactic to take them out is block there sun light capacitors so they fade after a few days.