The original. The archetypal high quality touring tire. GreenGuard. The highly elastic, India rubber layer is 3 mm thick. However, Green is not just the color, but also the philosophy: One third of the GreenGuard is made up of recycled latex products. "Anti-Aging". The Marathon sidewall construction can withstand the typical cracking that results from overloading due to insufficient inflation pressure for much longer. The Endurance Compound also guarantees durability.