Assertion: king penguin's layer | /r/HasProperty | down feather
Facets:
Source sentences:
text: The inner three layers are down feathers which are very effective insulation.
text: The outer layer of feathers are oiled and waterproof, and the inner three layers are down feathers, which act as very effective insulation as the bitter cold.
text: The inner three layers are down feathers, and are very effective insulaters.
text: The inner three layers are down feathers, very effective insulation.
text: The inner three layers are down feathers, very effective insulation.