Prayer armour in Runescape is not as often meant for protection, but lowering the rate at which prayer points drain, which can be useful in some battles.
Prayer armour is additional numerous in terms of varieties of armour obtainable, together with things from all 3 kinds of the combat triangle, typically providing good, though not outstanding, defence. A large portion of Prayer armour, similar to Magic armour, is however more in the line of robes, although it is this category that often provides the highest bonuses.
Most Prayer armour is only available for members, such as Proselyte. Exceptions include Monk's robes which can be obtained at the monastery and are obtainable by both free players and members.