The Alder Stool by Patricia Urquiola is made in biodegradable Matek in a mix of biodegradable plastic with either coffee shell or wood waste. This means that the Matek can eventually decompose back into nature. The Alder Stool is available in four biodegradable Matek variants: Biodegradable Beige, Light Green, Earth Grey, or Terracotta. The collection is designed for indoor and outdoor use.