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.