Our synthetic down is 100% hypoallergenic white polyester microfiber.åÊIt looks and feel just like our real goose down feather fill, but less expensive and without the feather shafts. Fill youråÊpillow to a medium weight to getåÊthat ‰ÛÏkarate chop‰ look. This filling material is synthetic and as such, it is naturally mold and mildew resistant and we therefore recommend it for allergy suffers.