Superior Leather

From Diablo 4 Wiki

The Alchemist will fashion this material from Rawhide for the Blacksmith to use.

Type Quality Description Found in Cost to Craft
Superior Leather Magic Rare leather used for improving armor.

Supple, rugged leather used for fine garments and even finer armor.

Various wildlife and beasts such as Bison. 5 Rawhide
200 Gold