The most sustainable wetsuit In the game. The Billabong Furnace Natural Zipperless is made with natural and recycled materials, so you're easier on the planet as well as on your body. Made from Yulex pure-stretch natural rubber sourced from FSC certified rubber plantations and our exclusive Ciclo-infused 100% recycled Superflex jersey, this men’s long-sleeve wetsuit features a zipperless entry for a performance-enhancing fit. Constructed with high-quality power seams and Superflex tape for watertight durability, the Furnace Natural keeps you flexible and warm while having less impact on the environment. Our mantra: make the best wetsuits, be good to the ocean.