All Amphibia sunglasses are made of the highest quality and ultra lightweight materials , including TR90 plastic frames (plastic equivalent to titanium), ultra lightweight, impact resistant, 100% polarized polycarbonate lenses, which completely eliminate glare by blocking all horizontal reflections. Each frame includes our patented AirCel Technology as well as our patented AirBridge Technology. These technologies combine to create our self-titled Extreme Float Rating (XFR). Also, the polymers in the AirBridge have been uniquely formulated to be slightly “tacky” thereby eliminating slippage at the bridge of each frame. Each lens has a hydrophobic coating on each side to repel water spray and help eliminate fogging. Also, each lens has an antireflective coating to eliminate annoying reflections on the interior side of the lens typically caused when the sun is at your back.