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Aluminum foil is a conductor. It really only insulates against radiative heat transfer by reflecting visible light rays or infrared heat rays. When wrapped around an object, pockets of air can act as insulation, but in this case it's the air that's doing the insulating-- not the foil. To answer the question, "it depends." Let's say you have a baked potato that you want to keep warm. First wrap in in foil so that the radiation coming off the potato is reflected back into the potato. Then wrap the potato in bubble wrap with the bubbles facing inward. This will trap any hot air that might surround the potato, preventing conductive and convective heat transfer. On the other hand, if you have a cold can of soda, and it's out in the sunlight, you'll want to first wrap the can in bubblewrap (bubbles facing the can) to trap the cool air and wrap foil around that to reflect any light rays. If the can is in a dark space, such as a lunch box or cooler, the aluminum foil will play a very small role in insulating it. The bubble wrap should go around the can (bubbles facing inward). The aluminum foil won't hurt as long as the foil does not touch the can. If it touches the can, it will conduct heat from the surroundings into the cold can.
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