Assertion: otter's fur | /r/MadeOf | two layers
Facets:
Source sentences:
text: The fur consists of two layers: a dark undercoat and longer, lighter-colored guard hairs, which trap a layer of air next to the skin to keep it dry.
text: The sea otter is covered in dense fur that consists of two layers.
text: Their fur actually consists of two layers, an undercoat and longer guard hairs.