Suspension systems for helmet assemblies provide enhanced stability and adjustability for installation in helmets across different platforms. A suspension system may include an upward stabilizing member extending from a support portion of the suspension system and a pivotally attached downward stabilizing member. The pivotal attachment between upward and downward stabilizing members allows the suspension to be appropriately incorporated into helmets that are subject to manufacturing and specification variability, while still providing flexibility for fit adjustments to the suspension system.