The breed has been used extensively for crossbreeding to produce sheep with various desirable characteristics, but particularly leanness, better wool production and improved fertility and fecundity (more lambs) and excellent "doing" ability. An important feature of Finnsheep is their thin, wrinkle-free skin and bare breech. This means Finn-cross sheep are much less susceptible to flystrike than Merinos and do not require mulesing, a contentious operation intended to reduce the incidence of flystrike. Their skins produce more better-quality wool, as well as superior leather.