Duluth. I’ve been wearing them for years, they seems to hold up pretty well. I like Kuhl as well but they are pretty expensive, I only ever buy then when I see a sale
My favorite by far is the Eddie Bauer expedition weight flannel. They go 1/2 off sale quite often. They are polyester and spandex so it’s stretchy but doesn’t shrink like cotton flannels. They last a long time too. Also, they come in tall sizes which is perfect for me at 6’8”and 210#. The large tall fits me like it’s custom tailored.