**TL;DR: Does the Celestial Armor require medium armor proficiency?**

I found the [Celestial Armor][1] which said that it is a **medium armor** [Chainmail][2]+3, and is light enough to be considered as **light armor**.

But, does it work just like a [Chainmail][3] made from [Celestial Mithral][4], which then makes the armor light enough to be considered as **light armor**, but still requires **medium armor** proficiency? After all, it does seem to be made from it, even if it doesn't state it.

When checking other armors, I found the [Elven Chain][5] which state that it is a [Chainmail][3], but should be considered as **light armor**, even from the proficiency point of view. But it also state that it is made from **Mithral** unlike the [Celestial Armor][1].


  [1]: https://www.d20pfsrd.com/magic-items/magic-armor/specific-magic-armor/celestial-armor/
  [2]: http://www.d20pfsrd.com/equipmenT/armor/chainmail
  [3]: https://www.d20pfsrd.com/equipment/armor/chainmail/
  [4]: http://www.d20pfsrd.com/equipment-/special-materials#TOC-Mithral
  [5]: http://www.d20pfsrd.com/magic-items/magic-armor/specific-magic-armor/elven-chain/