What is drop stitch floor?

What is drop stitch floor? Drop stitch floor mean the bottom floor for inflatable boats and kayak, which made of a double wall fabric structure, drop stitch fabric, as followings:

The drop stitch floor is inflatable. It's convenient to carry and light, but it's not rigid. Other floors, such as aluminum alloy floor and plastic steel floor, have strong rigidity. The disadvantage is that it's too heavy and inconvenient to carry. It depends on your use, whether you fish or how you play. The convenient one is the drop stitch floor.