Mithral Armor

[ Armure de mithral ]
Armor (medium or heavy but not hide), uncommon
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.
Dungeon MasterĀ“s Guide (SRD) D&D 5 › Magic Items