Griffin Survivor Carrying Case for iPod - Citron Independently tested and certified to meet conditions outlined in US Department of Defense MIL-STD-8 Integral display shield deflects wind and rain (Test: up to 200 mm/hr for 1 hour) Rigid internal frame protects against shocks and drops (Test: drop on flat concrete surface from 6'/ Sealed ports block blown sand and dust (Test: up to 18 m/sec for 1 hour) Silicone cladding blocks vibration (Test: 18 hrs at 20 to 2000 Hz)