Inspired by the iconic western mountain range, the Rocky takes high performance in a solid, aggressive frame to places others just can’t reach. With the detail- and mood-boosting HD Plus lens, the Rocky features a virtually indestructible Grilamid® construction, 100% UV protection, and small temple openings for a leash. Combines the superior clarity of Spy's digitally mastered High Definition lenses with the therapeutic and visual performance benefits of their patented Happy Lens™ . Enhanced color and contrast, improved mood and alertness, and impact resistant distortion free optics in one kick-ass package that SPY loyalists have come to know and love. It’s probably the best lens ever.