Often Jacob wool comes as roving-- that hairy quality makes great lofty, woolen-spun yarn-- and it's also naturally tri-colored, with white, chocolate black, and grey-lilac hues, so often it's left undyed. That being said, my first experience with Jacob was a dyed braid of combed top.
My second experience with Jacob, also on a spindle, was with more combed top-- this time undyed. I kept the twist much lighter, and as much as I loved the skein directly off the spindle, once washed it plumped up and became the skein I am most proud of to date. Judith MacKenzie says that "all fibers are governed by the first principles... all fibers will [forever be trying] to return to [their] original shape," and I really see that in the chocolate combed top-- it's like curly hair that's been straightened with an iron, and then when you wash it to set the twist... well, I have curly hair. Maybe that's an analogy that works better for me than for other people. In any case, what was a nice enough skein gained a lot of sproing and plumpness, and now it's become a skein I squeeze everytime I walk past it.