1. Easy to use without touching the soap, you can grab it easily without slipping.2. With roller foam, the rollers rub against each other to generate a rich foam.3. With built-in spring that keeps rising as the soap goes down, no waste for the soap.4. The soap does not touch the clothes directly, spreads evenly and quickly, making the clothes softer.5. Cleaning and storage is in a box, allows water to drain and makes soap more durable.