Review (2/5): It did not work
I bought the product thinking it would be easier to wash my toddler's hair, but it was nearly impossible to put this on my toddler's head. Maybe for a younger child who is able to be still and does not move, then this product might work. If your child has long hair, it would even be more difficult to put on. The other issue is that even if you put it on, then you have to still take off the hat and rinse off the section where the hat is, if you want to rinse off all the sample. The product is mailed directly from China, so it took a while to be delivered.
It seemed a good idea, but it just did not work at all.