Marnub is a Khajiit leatherworker who can be found at his store, Remarkable Leathers and More, at the Elden Tree Armory on the ground floor of Elden Root.
When approached, he sounds assertive, "This one knows your needs. You need lightweight, rugged armor to suit your active lifestyle. This one knows and can provide." If you choose to continue your dialogue, he adds, "Armor that does not hinder you from jumping and skulking about, yes? Marnub has this and more. Trust in Marnub. He does you no wrong."