Armor structure was improved with 3D knitting. In addition, a force-field helped keep the armor rigid.
The armor used solar power and integrated micro-circuitry. A thermocouple was used to handle extreme temperature and convert it to usable power, but it could be overloaded.
Repulsors were standard weaponry. The variobeam/uni-beam was capable of various effects. A tractor beam could be used to pull or tow objects. The most recent version of the armor was able to use pulse bolts.
Gyro-stabilizers were used in the boot jets.
Power pods were capable of various functions such as boosting other systems or being set to detonate.
ECM jamming was used to evade detection.
A hologram emitter created multiple images to make the armor harder to target.
In addition to the sonic emitter, a voice distorter helped protect Stark's identity and could also be used to duplicate sounds.
The armor could travel underground.
Freon could be emitted and a built-in fire extinguisher handled internal and external fire.
Finger lasers and a "sabresaw" were available for cutting through objects.
Life support was improved; the pacemaker was no longer needed after successful heart surgery.
A slave circuit was added to control older suits after the incident with Weasel Willis. However, this was a weakness when Midas attempted to gain control of the armors.
Sensors were upgraded with a full-band transceiver, infrared, and a 'life detector' that was keyed to several important personnel.