Mt. Fuji Sunsun SpongeA new color (blue) to celebrate the 50th anniversary is newly introduced along with the package of Mt Fuji. The Sunsun Sponge is highly effective for producing lather due to its structure, which contains a large amount of air. In addition to easily removing stubborn oil stains, it offers excellent foam retention and water drainage, making it hygienic to use. Crafted from high quality polyurethane with superior shape memory, it excels in durability.