Regia Premium Merino Yak 4-plyRegia Premium Merino Yak 4 ply is an exclusive sock yarn combining merino wool, yak, and polyamide for a functional blend. The yarn is made from 58% merino wool, 28% polyamide, and 14% yak. Yak wool is an extremely fine and thermoregulating fiber that adds a subtle mottled effect and incredible softness. Combining it with merino wool makes this yarn extra comfortable to work with, while the polyamide adds the necessary strength and elasticity. The