The third age mage hat is a members only piece of armour that is part of the Third age mage set. To wear the mage hat the player needs at least 65 Defence and 65 Magic. To obtain it, one can either receive one from a level 3 Treasure Trail, buy it on the GE, or buy from another player.
The hat is currently the seventh best mage item worn in the headwear slot in the game, beaten by the Ahrim's hood, hood of subjugation, ganodermic visor, Zuriel's hood, Virtus mask and tectonic mask.
It was long thought that the chances of obtaining a piece of third age armour was of about 1 in 10,000 (according to Paul Gower), and in 2010 Mod Maylea stated that the odds are lower than 1 in 100,000.  However, a livestream with Mod Simon and James revealed the mechanics of Treasure Trail rewards in detail, meaning the actual chances could be calculated: approximately 1 in 16,896 per item roll for any of the 12 parts of third age equipment, or approximately 1 in 202,752 for a specific part, per item roll - with an average of 5 item rewards per trail, this gives approximately 1 in 3,380 for any part, or 1 in 40,551 for a specific part, per trail completed. For a more detailed breakdown of drop mechanics and calculations, see Treasure Trails/Rewards#Hard.
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- patch 28 July 2009 (Update):
- The skill guide now talks about Third Age items in a singular sense.
- Updated the model for Third Age armour to not stretch when doing various emotes or riding on a magic carpet.