The infinity top is magic armour from the infinity robes set worn in the body slot. 50 Magic and 25 Defence is required to wear the infinity top. The infinity top can be obtained as a reward in the Mage Training Arena minigame by giving the Rewards Guardian 400 telekinetic, 450 alchemist, 4000 enchantment, and 400 graveyard pizazz points.
A light or dark infinity colour kit can be combined with an infinity top to make a light or dark infinity top, respectively. This is a cosmetic enhancement and does not change the stats in any way.