Assertion: sea otter's layer | /r/CapableOf | trap air
Facets:
value: to keep them
type: PURPOSE
value: for insulation
type: PURPOSE
Source sentences:
text: A thick layer of underfur covered by black, pale brown or silver guard hairs traps air for insulation.
text: Both types of otters need their coats to form a layer of insulation that traps air to keep them warm, and they certainly need it when areas like the Pacific dip to chilly temperatures that are often between 35° and 60° (and even lower than that as you move up the coast toward Alaska and Canada)!