A good mask typically possesses some or all of the following qualities:

1. Comfortable: Fits snugly without feeling suffocating or uncomfortable.
2. Breathable: Allows for easy breathing and doesn't trap moisture.
3. Durable: Made from sturdy materials that can withstand wear and tear.
4. Effective: Serves its purpose, whether protection, disguise, or creative expression.
5. Aesthetically pleasing: Visually appealing and matches personal style.
6. Secure: Stays in place without slipping or shifting.
7. Adjustable: Can be adjusted to fit different face shapes and sizes.
8. Hypoallergenic: Made from materials that won't irritate skin.
9. Easy to clean: Simple to maintain and keep hygienic.
10. Unique: Has a distinctive design or feature that sets it apart.
11. Functional: Has additional features like filters, ventilation, or visibility holes.
12. Safe: Doesn't obstruct vision, hearing, or breathing.