Features:

1. Size: The sunglasses be appropriately sized for children, with smaller frames and shorter temples to fit comfortably on their faces.

2. UV Protection: The sunglasses provide UV protection to shield the eyes from harmful ultraviolet rays. UV400 or 100% UV protection is ideal for ensuring the safety of children's eyes.

3. Durability: Kids can be rough on their accessories, so the sunglasses made of durable materials that can withstand daily wear and tear.

4. Comfort: The sunglasses comfortable to wear for extended periods. Features such as lightweight frames can enhance comfort.

5. Non-Toxic Materials: Safety is paramount when designing products for children, so the materials used should be non-toxic and meet safety standards.

6. Age-Appropriate Colors: Choose colors that are appealing to the target age group. Bright, fun colors are often a hit with children.

7. Easy Cleaning: Kids tend to get their accessories dirty, so consider materials and coatings that are easy to clean.