The Terrain is designed for our most demanding customers, and its well suited for those who require ballistic and safety protection for maximum coverage in a larger frame. With its polycarbonate lenses and frames constructed from the strongest thermoplastic material available for eyewear (TR90NZZ), the Terrain provides extreme impact resistance, durability, and flexibility in a lightweight package.signed for the most demanding customers, the Summit provides premium ballistic and safety rated protection in a smaller frame than the Terrain. Its TR90NZZ frames and polycarbonate lenses combine to create the same extreme impact resistance and versatility as the Terrain, but with a smaller fit and coverage.he Radius was created to merge maximum ballistic protection, comfort, coverage, and style.Designed with the shooter in mind, the frames provide full Z87+ ballistic protection, durability, and flexibility in a lightweight package. Like all Magpul Eyewear, the Radius is constructed of injected-molded TR90NZZ for maximum impact resistance, flexibility, and comfort. The aggressive 8-base wrap and high-coverage temples ensure protection from both the elements and debris, while the unique lens shape provides improved peripheral vision over other full coverage designs.