3.5, because it is very thin and really "believed" 100% chinaware is.

100 x 200 x 20 cm Pinzon Ultra Soft is unfortunately also "ultra thin". Unfortunately, one sees each wave of the mattress underneath. This is not so with my Jersey Bedsheets.
Apart from that but it's a really bad not cotton sheets that fits well and has a fairly good processing. It feels pleasantly smooth and after cotton.
The color white is not so bright, as in the photo, rather something in eggshell continuously. Wrinkle easily, but when it is stretched over the mattress, "warp" the back.
I prefer cotton bed sheet over Jersey, so I like it. Many alternatives are there not here and the price is quite good. Most cotton sheets cost more.
Cotton is, from the feeling, a little cooler as Jersey and firmer. Although it is here from the substance ago very thin ... well, usually located so a blanket over it.
There is no description of how to wash it in the specification at Amazon is 40 ° C. It has kept the shape of the first wash. 60 ° C would have been better for me ...
Also I have no Textilprüfzertifikate or where it was made. I guess, as the microfibre fitted sheets from Pinzon, also in China.