Waterproof polyester knitted fabric film is a type of fabric that is commonly used in outdoor and marine applications due to its waterproof and durable properties. Some of the advantages of waterproof polyester knitted fabric film include:

1. Waterproof: The waterproof polyester knitted fabric film is treated with a waterproof coating that makes it highly resistant to water and moisture. This makes it ideal for outdoor and marine applications, where it is exposed to wet and damp conditions.

2. Durable: The fabric film is made from a strong and durable polyester material that can withstand heavy use and exposure to the elements. This makes it suitable for a variety of applications, such as tents, tarps, and covers.
   

3. Breathable: Despite its waterproof properties, the fabric film is also breathable, which allows for moisture vapor to escape. This helps to reduce condensation and keep the fabric dry.

4. UV-resistant: The fabric film is treated with a UV-resistant coating that helps to protect it from damage caused by exposure to sunlight. This makes it ideal for use in outdoor and marine applications, where it is exposed to harsh UV rays.

5. Lightweight: The fabric film is lightweight and easy to handle, making it ideal for applications where weight is a concern, such as tents and tarps.

6. Easy to clean: The waterproof polyester knitted fabric film is easy to clean and maintain, which makes it a convenient choice for outdoor and marine applications.

In summary, waterproof polyester knitted fabric film is a versatile and durable fabric that is ideal for outdoor and marine applications due to its waterproof, breathable, UV-resistant, lightweight, and easy-to-clean properties.