It depends on the hair type.
e.g short hair or beards can be done with planes + translucent in your material, for long hair you use opacity mask + diffuse/specular/normal/probably also a subsurface map 
It depends on the hair type.
e.g short hair or beards can be done with planes + translucent in your material, for long hair you use opacity mask + diffuse/specular/normal/probably also a subsurface map