Tresemme naturals is a good one. I also have very long hair and this didnt weigh it down. However if you clarify what exactly you want to use it for (cowash, rinse out, or leave in) and include your hair properties you will get better recommendations

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This website will walk you through hair properties: texture, porosity...

HTH
3a/3b, Fine Hair, Low porosity, Medium Density
Poo- CHS Treatment Shampoo
Low-poo- Devacurl Low Poo
RO- Devacurl One Condition
Leave-In- KCKT/Curl Junkie Smoothing Lotion