This is for a trampoline set (both sides) and fits all Tandem Islands- including those before 2015. It also fits Adventure Islands dated after 2015. Added space for carrying gear, allows you to move weight outboard for better performance in windy conditions, comfortable sitting or laying down position, carry additional crew / kids / pets (does not increase basic weight capacity), reduce spray in cockpit. The other benefit to the trampoline kit is that when the wind picks up you can choose to lay out on the trampoline to save reefing the sail and you will get more speed out of the boat. combine with the hiking stick for that extra bit of performance. The trampolines are made from mesh vinyl as used on our catamaran product. Available in Gray or Black. Easy installation. Fast (side-release) buckles across aft aka make folding akas quick. Adjustable webbing straps for a tight fit. Rolls down and straps to forward aka for storage or easily slips off the aka. Paddle storage, gear pockets and lanyard grommets included. (200 Lb Capacity