Z-4190 bubble shield (Earth-2042)

The Z-4190 Temporal Protective Enfolder/Stationary Shield (Z-4190 TPE/SS), commonly referred to as the bubble shield, is a personal defense device. It is Forerunner in origin, but the Galactic Empire's Office of Imperial Intelligence manufactured a number of the devices based on discovery of those formerly used by Warrior-Servants for the Stormtrooper Corps.

Source

 * https://www.halopedia.org/Z-4190_bubble_shield