Costa's most high tech lens - 580 Glass provides superior clarity, ultra scratch-resistant, 100% UV protection and the best polarizing efficiency available. Blue Mirror Polarized is best for bright, full-sun situations on the open water and offshore. Costa's co-injected bio-based nylon frame material, TR-90, is both tough and durable, while offering a comfortable fit. Costa case and cleaning cloth included to keep your Costa's safe while you are getting after it If your Costa eyewear has a defect in materials or workmanship, Costa will fix or replace them to get you back on the water.