Schwalbe marathon 26in touring tyre greenguardthe original the archetypal high quality touring tire now completely revisedgreenguard the highly elastic india rubber layer is 3mm thick other manufacturers call such a tire plus however green is not just the colour but also the philosophy one third of the greenguard is made up of recycled latex productsanti aging the completely new sidewall construction can withstand for much longer the typical cracking resulting from overloading