The Aegis Cases features an inner-layer of shock-absorbing silicone with an outer-layer of hardened polycarbonate. The Aegis case also features silicone plugs over port openings and have a stick-on type screen protector and installation kit. The Trident Aegis Cases for mobile devices and tablets meet Military Standard Mil-STD-810F requirements for Vibration (Method 514.5) and Drop Protection (Method 516.5: 26 drops onto concrete from 4ft).