Stark's suits are each unique in design and purpose. They are made of incredibly-strong, fictional materials bolstered by a force field. Every suit has a self-contained environment, assorted onboard weapons systems, enhanced strength, flight, and various communications arrays and sensors, such as radar and radio. Furthermore, they typically have multiple power sources including a secondary solar energy collection function in the event that conventional recharging methods are unavailable. Earlier versions of the armor could also fold virtually flat, allowing Stark to store them in his bullet-proof briefcase.