The Defender Series iPhone 4 & 4S 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 and a built-in screen protector, making it one of the toughest iPhone 4S Cases and our best selling case. Why else do you think we called it the Defender Series?