Baksana - 95-5 Hungarian Goose Down Feather Duvet Inner Hungarian Goose Down is renowned for its superior thermal and insulating properties. This luxurious seasonal duvet inner is filled with 95 percent White Hungarian Goose Down and 5 percent Feather as per EN 12934. Covered in a 100 percent pure cotton down proof cover with box construction for an even filling. These duvets are like sleeping under a cloud. Sizes.