also: うもうふとん
noun
down duvet; feather quilt
A thick, warm duvet filled with down or feathers, commonly used in Japan as a type of futon.
冬は羽毛布団がないと寒くて眠れない。
In winter, I can't sleep without a down duvet because it's too cold.
この羽毛布団は軽くて暖かい。
This down duvet is light and warm.