I found this:
Amodimethicone and other similarly modified silicone polymers are considered to be among the best high-performance conditioning polymers currently available to the hair-care product formulator. They provide many unique benefits, including the following:

* Provide deep conditioning
* Provide targeted conditioning to areas of particularly damaged hair
* Protect from thermal damage
* Increase color retention
* Resist build up
* Impart gloss and shine

These modified silicones seem to be of particular benefit for those of us with damaged hair, permanently colored hair or those concerned about the buildup of conditioning agents . It would be necessary to use a shampoo containing one of the lauryl or laureth sulfates or cocamidopropyl betaine to completely remove this silicone from the hair, which may be of concern to those who prefer to use only conditioner-cleansing methods.

But what if the shampoo has the a-cone AND sulfates?? Does that mean we don't need to worry about the cone? Why would they put it in if the sulfate washes it out? I'm confused

Natural hair color - dark brunette
Fine, thinish hair/3a, 3b