This category is reserved for helmets that originally affected a Warframe's stats; one stat increase in exchange for one stat penalty. Starting from Hotfix 13.2.3 (2014-05-07), these helmets became no longer available from the Market or as a reward from Alerts, and "statless" variants, which are available today, replaced them. Arcane Helmets that existed before this change were kept intact and can be traded between players. Like other cosmetics, players are not able to acquire more than one of each helmet through trading or any other methods.
There are 27 Arcane Helmets in the game.
Arcane Enhancements were implemented to fill the role initially meant for these helmets, but cannot be applied to them. Do note that Arcane Helmets lock up an Arcane slot for your Warframe.
A summary of Arcane Helmets can be found below;
All items (27)