Hardened leather

Source
 can be bought from one of the following shops:
 * Fioravanti in Flotsam's town square
 * Sendler in Lobinden
 * Felicia Cori in Vergen's Rhundurin Square

 can also be crafted from Diagram: Hardened Leather which is sold by:
 * Fioravanti in Flotsam
 * Felicia Cori in Vergen's Rhundurin Square

Known uses
This crafting component is used to craft many pieces of armor, armor enhancements and even other crafting components. It is used in the following items:


 * Draug armor
 * Elder Blood gauntlets
 * Elder Blood trousers
 * Hardened leather boots
 * Heavy leather jacket
 * Kayran carapace armor reinforcements
 * Kayran carapace armor
 * Long robust gauntlets
 * Nilfgaardian falconer's gauntlets
 * Studded leather

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