Bathroom step stools are designed to provide a safe and stable platform for people to reach high places in the bathroom, such as sinks, shelves, or cabinets. Here are some key design features and functionality of bathroom step stools:

1. Height: Bathroom step stools are typically designed to raise the user's height by 6-12 inches, depending on the specific model. This provides enough height to reach high places while still maintaining stability and safety.

2. Stability: Stability is a critical design feature of bathroom step stools. Most models are designed with wide, non-slip bases to prevent tipping and provide a stable platform for the user.

3. Material: Bathroom step stools can be made from a variety of materials, including plastic, wood, or metal. The material used will depend on the specific design and intended use of the step stool.

4. Portability: Some bathroom step stools are designed to be lightweight and portable, making them easy to move around the bathroom as needed.

5. Folding Design: Many bathroom step stools feature a folding design that allows them to be easily stored when not in use. This can be especially useful in smaller bathrooms or homes with limited storage space.

6. Non-Slip Surface: The top of the step stool should have a non-slip surface to ensure that the user can stand safely and securely on the platform.

7. Weight Capacity: Bathroom step stools should be designed to support the weight of the user and any objects they may be carrying, such as toiletries or towels.

Overall, bathroom step stools are designed to provide a safe and stable platform for people to reach high places in the bathroom. They are typically designed with stability, portability, and user safety in mind, making them a useful and practical addition to any bathroom.