Polar bears have a layer of blubber up to 11 cm (4.3 in.) thick, which helps to keep them warm in the cold weather and while swimming.
(Polar bears; have; a layer of blubber up to 11 cm) (thick; helps; to keep them warm in the cold weather) Context(thick helps,List([58, 76))):(thick; helps to keep; them)
thick helps,List([58, 76))
Polar bears thick thick
have helps helps to keep
a layer of blubber up to 11 cm
to keep them warm in the cold weather
them