People are making mistakes with duvets, mattresses, names and their dimensions because they think they can buy by seeing. But, that is not so easy, especially when there are dimensions required for every sized mattress of the sheets, blankets and other. Check the size of your mattress to know which duvet to buy.  
See the tables and the schemes bellow so you can choose right and never make mistakes any more. Glad we’ve helped!

Source.

...