Mithral Armor
Armor (Any Medium or Heavy · Common
Mithral is a light, flexible metal. Armor made of this substance 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.
All text above is reproduced verbatim from the D&D 5e 2024 SRD. No AI interpretation.