It’s mostly fur, actually. They are, as my partner puts it, “round and fluffy,” and they are perfect the way they are.
I think this anonymous was asking about the reason behind the adaptation, Bill —LH
Edit: Oh. Well, that’s simple, anonymous. They were deliberately bred that way, to be honest. Because Alolans, too, acknowledge the wonder of a fluffy mane. (This may or may not also be why there are feral eevee on one of the islands.)