The natural loofah (luffa) we carry is slightly compressed for a more even appearance but otherwise left unprocessed. In fact if you shake some of them, seeds might fall out and you can plant them! They get softer after every use.
On the other hand, compressed loofah sponge pads have been pressed and stitched at the edges. They're better for scouring and brushing, replacing those green plastic-based scouring pads. As seen in the video, after soaking the first time, they will expand and stay expanded even after drying. This gives them some volume for you to grip on.
Both are compostable once they're worn out!