Feather Duvet, Single, Made in Japan, Polish White Duck Down 90%, Royal Gold Label ◆Guaranteed quality feathers with the five-star Royal Gold Label◆ It uses a luxurious 90% high-quality Polish white duck down. Poland, the world's finest producer Poland, a frigid country, is widely known as a producer of high-quality feathers. Ducks raised in these harsh climatic conditions have large down balls and retain high-quality down with excellent heat retention.