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Fill power is the measured loft or fluffiness of down filling, and is related to the insulating value or quality of the down. The higher the fill power, the more air pockets and as a result, the more insulating the down will be. The measurements range from just 175cm3/g to an impressive 900cm3/g for the top quality down.
The measurement is done by taking an ounce sample of down and placing it in a Plexiglas cylinder, which has a weighted compression piston. All duvets, sleeping bags and pillows made with high fill power are lighter with equal tog values than when made with lower quality down.