Unlike its namesake in San Francisco, the Alcatraz with Happy Lens™ is designed to let the good in and keep the bad out. It’s a vintage design with a modern look. Add in a handmade acetate construction, smooth 3-barrel hinges, and 6-base nylon lens, and this Alcatraz has everything you need to escape the perils of lesser sunglasses. Happy Lens™ enhances color and contrast, increases clarity, and improves mood and alertness Constructed from high-quality, handmade acetate 6-base nylon lens, with metal-clip on lenses on Black and Dark Tort colorways Includes a premium leather leash to help keep what’s yours, yours Smooth and secure 3-barrel hinges 100% UV protection reduces eye fatigue and long-term sun damage Frame measures 53-20-145