Schwalbe smart sam plus mtb tyre greenguardthe popular allrounder is now available with extra safe 3mm greenguard puncture protection greenguardthe insert of highly flexible natural rubber is 3mm thick its inner values are also green a third of the greenguard is produced from recycled latex products old products of natural rubber such as gloves inner tubes are shredded and after several process stages are again used as basic material in the puncture protection insertsfeaturessize