I've tied a few for some guys that fish Kentucky Lake using Yak hair which is a synthetic. The reason you will see synthetic a lot more is because these are large hair jigs that are 6" to 8" long and there are only a few suppliers of buck tail that has that kind of length. I got some a long time ago and the cost was outrageous and it still is judging by the price of some of these jigs. I can't the long buck tail anymore, probably because the bigger lure making outfits have grabbed all there is, so Yak fur is used along with some long hackle. Yak fur is a craft fur that is real long, you need to make full jig with it as it compresses a lot in the water but it does have good action.