Engineered composite and alloy materials reinforce a polycarbonate sub-frame to create a chassis that is rigid, light to resist twisting and bending. Aerospace grade carbon fiber used in MERC 3 reinforced chassis design. Co-molded Hit (High Impact TPU) technology provides extreme protection at both ends. Integrated buttons protect iPhone controls while providing quick and easy use of volume and on/off functions. Meets military specification drop-test requirements.