No, not a trampoline for bouncing, which is what I thought when I first saw this, too. The fabric bridge across a catamaran is also called a trampoline, and is constructed from strong fabric, sewn to the frame through the grommets around the edge of the fabric. Instructables user TimAnderson’s catamaran trampoline was in disrepair, so here he shows us how to repair the piece using the original grommets, but new fabric. He used a UV-resistant fabric for lasting strength in the sun.