The Spy Optics Flyer ANSI Sunglasses features a racing style design and superior optical performance. Features include the Happy Lens that increases mood and energy, a virtually indestructible Grilamid construction, and the Scoop ventilation system that increases airflow to decrease fogging. HD Plus The therapeutic and visual performance benefits of the patented Happy Lens combines with the superior clarity of digitally mastered High Definition lenses to create the next evolution in eyewear from SPY. Now you can enjoy enhanced color and contrast, improved mood and alertness, and impact resistant distortion-free optics in one kick-ass package. It's probably the best lens ever. Features Hytrel rubber nose pads and temple tips for a secure fit no matter how hard you sweat Scoop ventilation system increases airflow to reduce fogging Constructed from virtually indestructible Grilamid Interchangeable 8-base polycarbonate ARC lenses available 100% UV protection reduces eye fatigue and long-term sun damage Frame measures 74-16-128