To help fix this, designer Audrey Levy created Xero Cool during her studies at Central Saint Martins. At the center of Xero Cool is a surprisingly unassuming material – bacterial cellulose. To form the body of the fridge, Levy layered this grown material with wool felt and waterproof inner panels that keep moisture away from food. Also Read: iFLYTEK’s New AI Blackboard Turns Math Equation Into Live Graph in Real TimeVisually, Xero Cool looks nothing like a boxy metal appliance. By mixing nature and solar power, Xero Cool offers a kinder way to keep our food fresh.