It’s safe to say most fly anglers consider sunglasses a necessity on a few different levels—fish spotting and protection from wayward flies. The first and likely the most important test is whether or not the frames remain comfortable over an entire day of fishing. And without a doubt this was the case with the Costa frames. They’re lightweight so they don’t create pressure points after multiple hours of use. Costa attributes their lightweight feel to the fact they manufacture their frames from an earth-friendly bio-resin. Testers give company high marks for creating an environmentally responsible product (part of their Kick Plastic initiative). Along with their comfortable all-day feel, the glasses provide superior fish-spotting capability with Costa’s new Sunrise Silver Mirror lens. The lens is ideal for low-light conditions, which makes them extremely useful for any sight-casting applications. The lens is also versatile in changing light conditions. The Silver Mirrors are available in eight different frames. Check them out here.