Griffin "Survivor" Hard Shell Case with Protective Outer Soft Shell for iPAD 2 and iPAD 3 Independently tested and certified to meet conditions outlined in US Department of Defense MIL-STD-810F and UK Department of Defense Def-Stan 00-35 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'/1.8 m) Sealed ports block blown sand and dust (up to 18 m/sec for 1 hour) Silicone cladding blocks vibration (18 hrs at 20 to 2000 Hz)