The "Egg Cup Mini Double-layer Insulated Cup" typically has the following features:

1. Double-layer Insulation Design: This design helps maintain the temperature of the beverage, whether hot or cold. The inner and outer layers create an air barrier that reduces heat or cold loss, extending the time the drink stays at the desired temperature, usually for several hours.

2. Mini Size: Compact and easy to carry, it fits easily into a bag or car, making it ideal for short trips, office use, or outdoor activities.

3. Cute Appearance: The design may be cartoonish or creative, possibly mimicking the shape of an egg or featuring egg shell elements, making it fun and unique in appearance.

4. Lightweight and Easy to Use: The small size makes it lighter than traditional insulated cups, and the lid design is typically convenient for drinking. Many of these cups come with an easy-to-use screw-on lid to prevent leaks.

5. Material: These cups are usually made from stainless steel, with the exterior possibly featuring a non-slip coating or heat-resistant design for added safety and comfort.

6. Moderate Capacity: While mini in size, the capacity is 12oz, ideal for a single serving to drink in a short period.