An insulating glazing unit may be configured to provide both visible transparency and bullet-resistance. The bullet resistant properties of the unit may be achieved through the combination and coordination of different materials forming the panes of the unit. For example, the insulating glazing unit may include multiple laminate panes separated by a spacer. Each laminate pane may include at least two transparent rigid substrates joined by a layer of laminate material. The laminate material used in one laminate pane may be different than the laminate material used in another pane. For example, one pane may utilize a laminate material that is soft and flexible. This may help absorb and dissipate the impact of a projectile. By contrast, another laminate pane may utilize a laminate material that is stiff and rigid. This may help provide a final stopping force to a projectile.