The duo duvet is perfect for the central European winter. If that does not suffice (Central Europe is quite different), throw a second duvet over it. Usually a light summer duvet is sufficient, for those requiring more heat a moderate transition duvet.
The duo duvet Merino is certainly the most widely used, before the camel fluff variant which delivers a very good heat.
Note: Cashmere blankets are always individually manufactured goods that cannot be canceled or revoked free of charge.