Costa designed the Polarized Kiwa 580G Sunglasses to suit the eco-conscious adventurer. Costa composed the frame out of bio-based resin for a greener construction, and natural glass lenses illuminate heavenly optics when you're spending time on oceanic coasts. Their polarization cuts the glare off the water to drastically reduce eye strain when you're piloting a boat. They also filter out yellow lightalong with harmful sun raysto enhance the blue ocean, green lands, and the sunset's magnificent reds.