So you did it. You bought a new iPhone 4 and you want a slim, stylish case to protect it. The OtterBox Impact Series case for iPhone 4 is definitely your answer. This mighty silicone skin is tough enough to handle bumps, scratches and shocks-yet remains surprisingly thin. Remember, nobody does silicone skins like OtterBox. About our Impact Series: The OtterBox Impact Series is a durable silicone skin, brilliantly engineered with inner coring to dissipate shock away from your iPhone 4.