It is not sulphur dyed Max. It is reactive dyed. In reactive dyeing the dye molecules actually bond with the surface of the cloth, that is why you will get no colour transfer from the superback denim.
Got the jacket today, this thing is going to get some daily wear for the next 6 months Really glad I went with the large, I think it's a perfect fit. Will post some pics in the next few days.
^ the jacket looks great clop. If you don't mid me asking how did you size and how tall are you. I've been really wanting to get one, but I think it's just going to be too short. But the fit looks good on you!!
I'm basically 5' 11'', around 170. I sized L, though in the 27 shirt I went medium and I love the fit. I'm very happy with the fit of the L, especially because I wear it to work over a dress shirt and tie.