Your coat, your shoes and your wallet. A few examples of everyday utensils made from leather. Traditional leather is made from the skins of animals, the skin is tanned to make the proteins it contains insoluble in water. For example, chromium salts are used for this purpose, but these are toxic to humans and the environment. Besides traditional leather, there is also artificial leather. For the production of artificial leather, fossil raw materials and fuels, such as various plastics, are frequently used. These contribute to the overall CO2 emissions and the plastic soup. What if we could eliminate all these disadvantages with one alternative? Mycelium, the underground network of fungi, could be the answer. Fungi consist of threads that we can connect to each other, and the agents we use for connecting them also come from nature. In Growing Leather, together with BioscienZ and B4Plastics, we investigate how we can provide the obtained material the look, feel and mechanical properties of leather. And with a smaller CO2 footprint and labelled as vegan. That's how we make leather a sustainable product.