These trampolines are definitely a must have item if you are buying a Tandem Island. It turns the boat from a 2 person double into a boat that can fit perhaps up to 4 people. I put my two teenage sons on the side while my wife rides in the back. Its a pretty dry ride most of the time on the trampolines although you will have to tighten them up before you head out on the water. Tightening them while you are out on the water is impossible and I do not recommend it. The mesh itself is permeable so if the trampolines arent tightened enough or the passenger is too heavy, your butt will get wet. Its also pretty durable, I accidentally ran a knife against the mesh and it held tough. Pricey but good quality.