The Costa Del Mar Tuna Alley Sunglasses are durable and perfect for being out on the water with their integral hinges, patented vented system and tough-as-nails nylon material. These sunglasses allow for clarity and less glare. Features: Lens Size: 61mm/40mm Temple Length: 115mm Bridge/DBL: 13mm/10mm Base Curve: 8 base Frame Material: Nylon RX-ABLEIncludes hard case100% UV light blockage for max protection100% polarization prevents reflected glare and reduces eye strain Lifetime warranty.