They are made of high quality leather. The Look Has The Style Of The 1960s And 1970s. The Omp Logo Has Been Discreetly Engraved On The Exterior Of The Shoe. The lining is made of soft and comfortable leather, while the sole is made of oil- and gasoline-resistant rubber. The exposed sections have been reinforced with a specially formulated rubber compound, so the sole of the shoe remains thinner, providing an even better pedaling feel. Hand Finished.