FLT lenses by Method Seven are the first to offer notch filtering in lightweight, shatterproof lenses. Constructed from a durable polymer with dual high-quality coatings, FLT lenses are at the cutting edge of aviation optics. The only clip-ons with notch filtering allow you to transition seamlessly between looking inside and outside of the cockpit. Enhanced contrast, impossible clarity, world-class performance. The FLT 18% (Medium) is a great choice for general and mixed conditions. Though it has a similar VLT to most other avionic sunglasses, notch filtering and world-class protection make this lens superior to others on the market. Our Pilot new and improved style clip-on has spring-loaded rubber-coated metal clips that gently hold to your prescription glasses. Best suited to fit over larger lenses, the Pilot Clip-On FLT18 features lightweight materials for both comfort and classic style. Dimensions: 50mm (lens height) x 12mm (bridge width) x 132mm (full width).