Interchangeable Lens: Most Natives are designed to quickly and effectively utilize all of the Native's lens options, so you can adjust to varying light conditions. Rhyno-Tuff Air Frames: High-performance thermoplastic material, extremely lightweight, yet durable enough to withstand high-velocity collisions and temperature extremes. Venting System: Exhaust vents incorporated into the design framework enhance airflow, which virtually eliminates fog and condensation. This unique design feature is the only system available that allows maximum ventilations while blocking extraneous incoming light. Cushinol: Ensures non-slip grip, soft feel and custom fit. Cam-Action Hinge: It allows the temple to quickly lock into position, getting you ready for action. Mastoid Temple Grip: Ensures the temple ends hug the mastoid bone (behind your ears), allowing for a secure and comfortable fit. Comes with Optic Gear Kit.