I thought about this concept a week ago after constantly dinging my fins in my room. So I tore apart my old Mutant and sewed two pieces together to make a fin cover. It takes about 30-40 min, depending if you have the material already. You just draw and outline of your fin, cut, and sew together! Super easy, and fun. Here is what you need and the end product on my 9'5 Gato flex fin. This is just the first one, so its a little messed up.