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. Enhanced contrast, impossible clarity, world-class performance: these are not your father's aviators. 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. The Altitude frame's advanced construction combines titanium alloy and cutting edge injected plastics for incredible fit and peripheral vision with unique styling. The frames are designed specifically for headsets.