Exterior coating: 90% PA microfibers / 10% PU Lining and inner sole: 50% PA / 40% adhesive fibers / 10% PU Outsole: neolite Waxed laces: 100% recycled cotton 3 cm flat heel * All our models are vegan, labeled PETA APPROVED VEGAN, certified OEKO TEX 100 and INESCOP (materials guaranteed to be free of toxic products for the body and the environment).