edited because I didn't actually answer the question the first time.
I can think of some heavy conditioners that happen to be leave-ins. ... The Paul Mitchell "The Conditioner", and Kirkland Lemon Gingerroot. My favorite heavy conditioner isn't a leave in- Suave BioBasics, contains a silicone. Heavy conditioners tend to deposit more conditioning agents and coating agents in the hair. Light conditioners tend to rinse out with the water, which is why they work great for CO washes.
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