Unrivalled insulation from the world's most exclusive bedcovering Eider ducks breed in one of the harshest climates in the world, so they're born to stay warm. Eider down is ultra-light & fluffy; the fibres flex & lock together, creating thousands of tiny air pockets that trap warmth without feeling bulky. Our down is painstakingly handpicked from fledged Eider nests in Iceland for a sustainable & natural way for you to stay supremely warm at night. This light-as-air down is encased in beautiful 320 thread count German batiste. The soft grey cotton gently downplays the naturally dark grey colour of the Eider down. This is altogether a truly wonderful duvet.