If you are interested in fine cotton duvets I will have you know that the difference in fineness of material for thread counts above 350 is hardly noticeable. You can actually check it out yourself next time you are in a linen store. for those that might feel that there is a difference in the high level thread counts then if they have that kind of money they are free to buy them .
You should be able to get duvet covers of fine cotton under any of the following: red and white duvet cover silver silk duvet cover red flannel duvet cover
Cotton duvet covers come in various types differing in quality, strength, comfort and style. The most expensive cotton duvets are made from Egyptian and Swiss cotton. Just to give you an idea of how fine it is, this material is used for making babies bedding linen. For those that are looking for something classy and has style then this is for you.
For those that want to strike a balance between the price of the covers and the style that they want . As I mentioned earlier you could also look to a more relatively cheaper type of cotton or fabric with a high thread count to give you the same effect as the high quality cotton.
The size of the yarn also has an effect on the fineness of the material considering the number of spins of particular yarn then you would notice that a multiple wound yarn has a finer feel then a single ply yarn. other covers also undergo a process that adds to the overall finish and most covers do not undergo this process. What this process does is it makes the material wrinkle free and helps it maintain its color. You will be able to tell by simply picking up the cover and having a feel of it. Once you get used to the whole experience then it will become easy for you to spot the kind of finish.