PVC drop stitch double fabric is a material used in the construction of inflatable watercraft, such as inflatable stand-up paddleboards and inflatable kayaks. It has several advantages over traditional inflatable materials, such as PVC single layer or rubber. Some of the key advantages of PVC drop stitch double fabric include:

1. Increased durability: PVC drop stitch double fabric is much more durable than traditional inflatable materials, as it has a double layer of fabric that provides extra strength and protection against punctures and abrasions.
   

2. Better rigidity: The drop stitch construction of the material allows for improved rigidity, which makes inflatable watercraft made with PVC drop stitch double fabric more stable and easier to maneuver on the water.

3. Increased air pressure: PVC drop stitch double fabric can handle higher air pressure, which allows for a more rigid and stable inflatable watercraft.

4. Improved performance: With the increased rigidity and air pressure, inflatable watercraft made with PVC drop stitch double fabric tend to perform better, especially in choppy or windy conditions.

5. Easy to repair: In the event of a puncture or tear, PVC drop stitch double fabric is relatively easy to repair, making it a more convenient option for watercraft owners.

6. Lightweight: Despite its increased durability, PVC drop stitch double fabric is still relatively lightweight, making it easier to transport and store inflatable watercraft made with this material.

In summary, PVC drop stitch double fabric is an excellent choice for inflatable watercraft, offering a combination of durability, rigidity, and performance, as well as being relatively lightweight and easy to repair.