Tested and certified to meet or exceed US Department of Defense Standard 810F and UK Department of Defense Standard 00-35, the Griffin Survivor Case for iPod touch 4G is designed from the inside out to protect your iPod touch from dirt, sand, rain, shock, vibration and a host of other environmental factors. Survivor is built on a shatter-resistant polycarbonate frame clad in rugged, shock-absorbing silicone.