Studded Leather Armor is armor made from soft leather, with metal rivets added to it to provide more protection. It has a weight of 25 lbs and it offers a basic Armor Class of 7, with an additional -2 bonus to AC against slashing attacks and -1 bonus to AC against piercing. This armor is the most powerful type of armor which can be worn by thieves and is a significant upgrade from normal leather, which actually provides no protection against slashing and piercing attacks.
Studded leather armor has little in common with normal leather armor. While leather armor is a hardened shell, studded leather armor is soft and supple with hundreds of metal rivets affixed. The rivets are so close together that they form a flexible coating of hard metal that turns aside slashing and cutting attacks. The soft leather backing is little more than a means of securing the rivets in place.