Quidad Botanical Boost. Loaded with protein (a few different proteins) and moisture. I could use it instead of conditioner for my fine waves. A great quick shot of protein, good for SOTC-ing or detangling or as a leave-in, no cones or heavy stuff and doesn't make me itch!
I have a sample bottle. The scent is light. It's not cheap, but I think the big bottle would last a very long time.