Drow Adamantine Chain +5

Drow Adamantine Chain (Drow Elven Chain +5 in-game) is enchanted elven chain mail +5 which bestows an armor class of 0 upon the wearer. Like Drow Elven Chain, this armor can be worn by stealthy characters with a penalty to their thieving abilities, and it does not disable spell casting. Unlike Drow Elven Chain, it does not offer bonuses to magic resistance or casting time. Like all adamantine armor, it will dissolve to Adamantine Dust if it's exposed to sunlight.

Description
"The delicate yet sturdy craftsmanship of the Elven races allows them to design many beautiful yet utilitarian goods. Among these is Elven chain mail, which is so finely wrought that it can be worn under normal clothing without revealing its presence. This and its lightness allows it to be worn by thieves and fighter/mages with few restrictions. This item, like most drow equipment, is created using adamantine, an alloy of adamantite that quickly turns to dust if removed from the Underdark."