I tried some wool batts for pillows and found that they compress too much for comfortable head pillows. I prefer natural latex "shreds" for that use. But we have chair seats and backs made from felted wool batts that are perfect for that purpose. The chairs have a woven rope seat and back on a metal frame, with
wood arms and legs. The seats are about 4" thick and the backs about 1-1/2" and covered with denim fabric or crocheted wool rug yarn. BTW, I don't tolerate commercial foam pillows as they off-gas something toxic that makes me feel sick.