Overnight is described as a "cool black [with a Matte finish]." It's a deep black with cool undertones and a matte finish. It had decent to good color coverage, but I wish it was more blendable. The texture was a little drier and stiffer, and this translated to application as well. It did wear for eight hours, though. See comparison swatches / view dupes.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.