A separate issue is the question about leather. It is an extremely diverse, but always natural material of animal origin. It is a managed waste from the food industry. It is also biodegradable. From this point of view, it meets the ecological criteria. Unlike other materials, it is also a flexible material which deforms and adapts to the shape of the foot. Natural leather can be restored to its fresh look, colour and improve its comfort. And of course it is durable. It is worth choosing shoes with the greatest possible share of natural leather. And then take a little care of them.