Sulphate-free shampoos are great, and often necessary, for hair that requires added moisture retention. Extra beneficial for curly and afro hair since sulfate-free shampoos do not have foaming agents which traditionally strip curly and afro hair. Sulphate-free shampoos are also a go-to option if you have dry hair or/and an irritated scalp since they retain moisture for creating hair that is hydrated, vibrant, and overall healthier.