Hamlin frames feature Stainless Steel Integral Hinges, Co-Molded Frame, Megol Nose Pads and tips and high coverage design. Fits a Medium to Large shape best. 580,580P and 400 Lens available. Costa 580G High-Tech. High-Performance. The Ultimate Lens. Yellow light is the enemy. Costa's patented 580 lenses incorporate an advanced filtering compound into the lens material that reduces yellow light. This delivers enhanced colors and better visual acuity in any conditions. And since it's embedded in the lens, it's warrantied to last for the life of the glasses. Costa 580P True 580 Technology. Lightweight. Impact-Resistant - Durable. Just like Costa 580G, the new Costa 580P lenses block yellow light and boost red, green and blue light. They are the clearest lenses on the planet. Costa 400 Designed for adventure. Built to perform. 100% polarization. 100% UV protection. Unmatched clarity, contrast and definition. This is what you'll see through every pair of Costa 400 lenses.