Duck Down & Feather 20/80 20% down clusters. It is made up of a blend of small duck feathers (with a quill) and duck down (no quill). 
This filling is a more economical option as it is not as expensive as a pure down filling and has a beautiful loft. 
The higher the fill power of the filling, the higher the quality, the higher the loft and the longer the pillow will retain its firmness.