Stone Smart Solutions, formerly known as Protective Solutions Group International, develops protective-design products and services for extreme loading events such as explosions, ballistic attacks and forced entry. Its New York-based work spans research and development, software and training, while affiliated ventures add large-scale blast testing and modular mitigation systems. The company also developed ProtectiFlex, a lightweight concrete-like material designed to absorb energy and support blast- and ballistic-resistant construction.