Adult Natural Rubber Wetsuit in Long Sleeve TopWe've sourced the most amazingly soft natural rubber for our wetsuits! These are derived differently than regular neoprene wetsuits, which are traditionally made in a similar way as car tires. So instead of using petroleum, our Japanese neoprene is made from limestone from the reputable Yamamoto company. It's soft, stretchy and a tiny bit kinder to the environment than petroleum neoprene. Two styles with a top and a fullsuit option Natural Rubber 2.