I first posted this roundup not long after the iPhone 4 hit stores and it's been through several updates, and now only includes cases that fit both the iPhone 4 and 4S and carry the "universal fit" tag.
Update, May 15, 2012: Added Griffin Survivor and Gumdrop Drop Tech Series.
As I've said before, how you choose to protect -- or not protect -- your iPhone is a matter of personal preference. But if some heavy-duty shielding is what 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, 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 iPod docks and certain charging accessories due to how recessed the ports become when the case is on.
Click on any image to begin slideshow.
Note: The top-20 is listed in alphabetical order, not by ranking. If you don't agree with our choices or feel we missed some, please submit a comment, and I'll consider making changes in my next update of the list.