Maybe the meaning of Flannel has changed since I was a kid, but these did NOT feel any different than any cheap, generic, "cotton" sheets you get from the store. Absolutely NO fuzziness, softness, and NO thick warm feeling to them at all! I IMMEDIATELY regret my purchase, even on 50% sale. Not at all what I expected even with low expectation. 
Another important detail if you're trying to have a nice bed set up: They are WHITE white brown print on one side. NOT Brown with white printed pattern. SO when you have you bed half open, or made up in a way to be nice you can see these cheap white sheets with a poorly printed brown side. It looks so bad. 

Summery: NOT fuzzy warm flannel you remember from Grandmas house over Christmas break. Thin, cheap, rough. And NOT brown, actually WHITE with one side printed brown. (not dyed as it's only on one side. fabric is white, looks awful)