We've never had flannel sheets before, and they're fantastic. When it's cold outside, they're perfect for snuggling into. We noticed the black die smearing over into the white after 4 weeks of use on our fitted sheet in the area where we lay/sleep. I'm not sure if this will wash out, but if it's smearing into the white fabric, I'm guessing it's also getting on our pajamas or skin. That is troubling. When I washed it before using, I didn't notice any discoloration. I'm disappointed, and if I had known, I would not have purchased the black/white design. I had also purchased a set as a gift for someone, so I'm hoping she hasn't opened the package yet and can return it.