If you're the kind of iPhone 4 or iPod Touch 4 user who has a hard time keeping their device in mint condition, Performance Designed Products has eight new case options for you to potentially marvel over. PDP's new line of Marvel Comics cases cover devices in vintage comic art to help fans sustain the life of their smart phone while sporting Spider-Man, Iron Man, Hulk, Silver Surfer, Magneto, Wolverine and/or Captain America pride. If you want to get literal about shielding your device from harm, there's also a Captain America: The First Avenger case adorned in the Sentinel of Liberty's signature accessory.Provided you dig the case designs (which are compatible with both the AT&T and Verizon versions of the iPhone 4), now isn't a bad time to pick one up. The $29.99 cases are on sale for 20 percent off at the PDP store with the code "comiccon2011" through the end of August.

Check out PDP's iPhone 4 cases below: