The brompton schwalbe marathon tyre is the archetypal high quality touring tyre with the highly elastic greenguard layer is 3 mm thick which one third of the greenguard is made up of recycled latex products this is made from old products of natural rubber such as gloves inner tubes which are shredded and after several process stages are again used as basic material in the puncture protection inserts the anti aging sidewall can withstand the typical cracking that results from overl