Free Shipping & Easy Returns! Explore Costa Blackfin Sunglasses now. Costa Blackfin sunglasses for men offer a fresh interpretation of a classic rectangular silhouette. The rounded edges soften the lines of these handsome, eco-friendly frames constructed from plastic that’s lightweight and durable. A keyhole at the upper rim displays your smile, while wide temples curve inward to keep the shades from slipping during active pursuits. Enjoy sunny-day sightseeing in distinctive style when you slip on these Blackfin sunglasses from Costa. About Costa Eyewear Costa eyewear is made for those with an active lifestyle, bringing a healthy dose of fashion to the beach or trailhead. Polarized sunglasses, eyeglasses, and C-Mates bifocal readers by Costa will help you navigate in any direction your adventure leads. Created by fisherman for fisherman in the late 1980s, Costa continues to create quality sunglasses and eyeglasses with innovative technologies. These performance glasses were "born on the water," and they’re made to last—each pair is a worthy investment. 100% Authentic Costa FramesDirect.com is an authorized Costa dealer, selling only 100% authentic Costa 580 polarized lenses with its sunglasses, prescription sunglasses, and readers frames. Costa brings you the best of both worlds—innovative lens technology paired with authentic Costa frames for any outdoor adventure. Additional Information: Costa Lens Colors and Materials (PDF)