I recommend the no-wash ampoule treatment.

This is the Healing Bird No-Wash Ampoule Treatment. You just spray it on like a spray bottle, and that's it. You do need to shake it slightly before spraying. Compared to other products, it is incredibly simple and great. If you spray it after washing your hair and before it dries, your hair feels super bouncy and nice. I also use the Healing Bird No-Wash Treatment in the form of a liquid, and both are good. It is so convenient and great. I recommend it because it is easy to use in the summer!