Hair

Yak Hair is a 100% drop From Yaks. Yaks can be found on the island of Neitiznot, not too far from a bank. Getting to the island only requires partial completion of the quest The Fremennik Isles.

Yaks are popular due to their low defence and high hitpoints. Higher level palyers will often train strength here, and most often these players will not pick up drops, so obtaining a full inventory of yak hair is relatively easy.