I'm-a step up to the mic in my goose down (goose down)

from Beastie Boys – Root Down Lyrics on Rap Genius

Meaning

Down is a material used for padding and thermal insulation in goods such as sleeping bags, pillows, jackets, and bedding. The down of birds is a layer of delicate feathers beneath the tougher exterior feathers. If well cared for, down retains its loft up to 3x as long as most synthetics. To be labeled ‘Goose Down’ a product must contain no less than 90% goose feathers.

It is unlikely that the above outfits (from the “Alive” video) are made of down, but they look real plush, nonetheless. “A percentage of the world’s supply of down feathers has been plucked from live birds, a practice which is condemned as cruel by animal welfare groups.” Given the Beastie Boys' position on animal rights, it is doubtful that they would purchase or wear clothing that brought harm to innocent creatures.

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