He can cure yak-hides for 5 coins each to make cured yak-hides. To do this, players must have started The Fremennik Isles quest up to the point where they are preparing for the fight. After the quest, players can have him cure yak-hides by right-clicking him and selecting "Craft-Goods". An alternative method is to use yak-hide on him, which can skip one dialogue screen.