The iPhone 4 / 4S Defender Series case provides heavy duty protection against drops, dust and damage without taking away from the usability of the iPhone's features. The iPhone 4S Defender Series case offers triple-layer protection and is built from a high-impact polycarbonate shell, durable silicone slipcover and a built-in screen protector, making it one of the toughest cases for the iPhone 4 and iPhone 4S. Why else do you think we called it the Defender Series? Want to build your own? Check out our Defender Series Build Your Own iPhone 4 / 4S case.