Genuine SVIG Ghiblis soling material. Made in Italy and 10 MM thick. Colors available are Black, Brown, Beige and White with the traditional dog bone design. Soles are approximately 10mm thick. The Ghiblis compound is microcellular rubber that according to the SVIG website is a well-performing compound, extremely light, flexible and anti-slip. We love the SVIG line of products. In our humble opinion, these soles last longer than the traditional Birkenstock soles.