The Shed’s open infrastructure can be permanently flexible for an unknowable future and responsive to variability in scale, media, technology, and the evolving needs of artists. The Shed’s 120-foot tall (37 m) movable shell is made of an exposed steel diagrid frame, clad in translucent cushions of a strong and lightweight Teflon- based polymer, called ethylene tetrafluoroethylene (ETFE). This material has the thermal properties of insulating glass at a fraction of the weight. The Shed’s ETFE panels are some of the largest ever produced, measuring almost 70 feet (21 m) in length in some areas.