Trident Case Kraken II Series for iPhone 4 (AT&T and Verizon) with Holster - Ballistic Green Three-Layer Protection Impact-insulating silicone Double-Enforced Corners All Kraken Series cases are designed to handle substantial drops and other impacts. Each corner of the Kraken II for iPhone 4 features reinforced, shock absorbing silicone for extra protection. Dust and Debris Insulation The case comes with permanently attached dust filters over speaker and microphone bays to block even the most miniscule speck of debris. Audio and power jacks are both covered under the silicone skin with firm, removable plugs Removable Sleeve for Easy Docking The bottom of the case features a removable silicone sleeve which allows the case to be placed in a docking station without the hassle of removing the case.