Opal duvets by Brinkhaus are part of a system of duvets, all made from premier Hungarian goose down fillings and the finest cases.Each duvet can be purchased separately, or in pairs, used separately or later combined in many different ways.Each one has a unique system of strong, lightweight, stainless nickel-free metal press studs. As the seasons change, this system gives a complete solution to suit your individual needs and puts you in control. The Opal duvet is ultra-lightweight for Summer use, or can be combined with the Crystal, Gem or Pearl duvets by Brinkhaus for increased warmth.