I've tried various products, but they don't dissolve well in water and are too hard, yet after washing my hair, I feel refreshed and it seems gentle.

There are no disappointing aspects. While it feels slightly smaller in size compared to other products, it still does not melt and disappear too quickly.

I usually have a medium-length hairstyle, and I've been using this product for about 4 years with satisfaction. It produces an appropriate amount of lather, has a subtle fragrance, and doesn't leave my hair feeling stiff, even though it's in bar form rather than a plastic bottle. It's also compact in size compared to regular shampoos, so one bar lasts me around 6 months. I could split it in half to make it last even longer, but I find that too inconvenient, so I just use it as a whole bar.

Over time, as the soap becomes smaller, it becomes more difficult to create lather. In those cases, using a loofah can help create lather, but it can be a bit inconvenient. It would be great if travel-sized smaller versions were available.

It is good to use the Donggu field rinse together. I sometimes manage my scalp/hair with coffee, and when used together, I feel that my hair becomes thicker and healthier.