Item Type: Armor

Item Rarity: Uncommon

Requires Attunement: No

D&D Beyond: Mithral Armor

Source: Player's Handbook

Mithral is a light, flexible metal. A mithral chain shirt or breastplate can be worn under normal clothes. If the armor normally imposes disadvantage on Dexterity (Stealth) checks or has a Strength requirement, the mithral version of the armor doesn’t.