Sebastian Professional Dark Oil Smooth and Shine Conditioner is a daily, rinse-out conditioner built around argan and jojoba oil to detangle and smooth hair without adding heaviness. Formulated by Sebastian Professional (Wella), it uses amodimethicone and panthenol alongside the two oils to close the cuticle, cut down on brushing friction and leave strands with a silky, glass-like shine. Because the base is lightweight, it suits fine-to-medium hair as easily as coarse or frizz-prone hair that needs extra slip. Follow it with Dark Oil Smooth & Shine Styling Oil on towel-dried ends for additional smoothing.