ForceFlex technology uses a patented, multi-injection molding of the lens with a thermo plastic urethane (TPU) frame. The unique TPU material allows the frame to flex and fit any size face—small or large. Plus, ForceFlex can achieve a military ballistic level impact resistance at over 1000 feet per second. Dual-material temples on these Safety Glasses combine TPU material for comfort and grip and polycarbonate for durability. The universal nosebridge comfortably fits any face type. Flexible bayonet temples make sure the glasses can slip on and off easily under your helmet, head set, or other headgear. Each pair includes microfiber cleaning bag.