100% goose down - The Irisette Luna down comforters provide a natural, healthy sleeping experience with unparalleled lightness. Finest white new goose down, enveloped in pure cotton fabric (Mako down batiste), ensures a uniquely cozy and exceptionally light sleeping sensation. The wonderfully fluffy and airy down filling is moisture-regulating, highly breathable, and offers a dry sleeping climate that is essential for restful, healthy sleep.