Every shoe is unique, every single one is original. This model is made in quantity of 150 pairs using leftover pieces of rubber in a traditional vulcanization process is what creates the unique marbled look of the outsole. Please note that the left and right shoe will also not be exactly the same, but that is the charm of this kind of partially hand crafted manufacturing. Materials: Upper: 100% cotton Outsole: 100% recycled rubber Produced in the Czech Republic with existing tools and machinery from the past century. Made without glue and entirely vegan, with PETA certificate.