Hobie 18 Catamaran Aftermarket Replacement Trampoline Polypropylene UV resistant mesh and UV resistant thread, to hold up in sun and salt water Marine grade brass, rolled rim, spur style grommets, installed with a heavy duty pneumatic press andreinforced with webbing on the underside All ropes and webbing reinforce with at least 4 rows of stitching Adjustable / removable hiking straps for easy tightening or removal (if you prefer a clear deck) Mesh fabric allowing for airflow and water drainage