To confirm a good quality car cabin filter, you can check for the following features:

1. High filtration efficiency: A good quality filter should have a high filtration efficiency that can trap and remove a wide range of contaminants, including dust, pollen, mold spores, and other allergens. The filter should also be able to remove noxious gases and unpleasant odors from the interior of your car.
2. High dust holding capacity: A good quality filter should have a high dust holding capacity, which means it can trap a large amount of pollutants before needing to be replaced.
3. High quality materials: The filter should be made from high-quality materials that can withstand exposure to extreme temperatures, humidity, and other environmental factors.
4. Easy to install: The filter should be designed for easy installation, so that you can replace it quickly and easily without any special tools or expertise.
5. Manufacturer's warranty: A good quality filter should come with a manufacturer's warranty that guarantees its quality and performance.6. Brand reputation: It's important to choose a well-known and reputable brand that has a track record of producing high-quality filters that meet the needs of car owners.