Not the 4400 but a few 3100 seats. The material that looks like cotton is in fact cotton. If you go to shop for some (over time it absorbs humidity and rots causing some really nauseating odors), shop for cotton batting. It isn't expensive and should be replaced when you're recovering your seat. It also has a tendency to wallow out where you and the passenger sit.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
I'm just in the process of recovering my seat and plan on reusing the fiber layer that was on the bottom cushion, but not the cotton batting. I got the seat covers and installation kit from Jim Carter and they provided burlap (1st layer) felt (2nd layer) and cotton batting (3rd and 4th layers), along with the covers. The original cotton was gone where the driver sits and pretty funky elsewhere (signs of mold, etc.) The cotton layer came off the fiber layer, which is in pretty good shape, in some areas but not in others, so used a wire brush to get the remnants off. Kind of like shearing sheep.
I think the fiber layer will work better than felt, but like Jon said, the cotton is going away.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
MH50 Use quilt batting from Wally world,juggle in good springs,pad it and tie in place with holiday ribbon (so it wont show thru is flat thin and tuff ). Your wife can probably sew-up your covers,I use kinda stiff canvas on my beaters so I can kinda slide across it.
MH50 Another thing is to get rid of the old padding,your trucck will smell so much better. The AD truck seats are not hard to cover and you can adjust them and add to your padding. Also make a fresh cardboard head liner about every 5 years,not as much cussing when you tear those !!