There are iPhone users that rather have longer battery life on their units, others rather protect the equipment. How about those that wish to protect the unit and have longer battery life? Well, now days we have a solution, we have a case that protects your unit and has a built in battery. If that's the kind of heavy-duty shielding and battery life extension you're looking for, this is the list for you. While I tried to pick tough, protective cases that look good and don't make your iPhone too bulky, I should point out that a few of the cases have more extreme designs that aren't necessarily intended for everyday use. I should also note that some of the more rugged cases can be a bit of a chore to remove and aren't friendly toward iPhone docks. However, this unit is light on weight; the whole case, which is composed of a hard plastic, is sturdy. The complete case is lined with a special material which protects the entire iPhone 4 nicely.