Rigid
Advanced Elements have taken drop-stitch technology and used it to create rigid, high-pressure floors for the AdvancedFrame line of inflatable kayaks.
You can see from this image that the high pressure DS floor creates a kayak hull with corners (called chines).
The chines make the kayak track straighter.
The high pressure floor spreads the weight of the paddlers more evenly, so the hull is flatter and glides better through the water.