The new GreenGuard puncture protection layer consists of natural rubber of which one-third is recycled material. Additionally Schwalbe developed its own processing technology: In Schwalbe’s factories products made of natural rubber (like gloves, tubes etc….) are ground up and after several processes re-emerge as natural raw material.GreenGuardSame principle as the SmartGuard, but only about 3mm thick. One-third of the highly elastic India rubber is made up of recycled latex products. The same safety, but affordable PunctureGuard is not as highly elastic.