Shark began by addressing the technological needs of water sports enthusiasts. They are the world’s first pair of water sports sunglasses with interchangeable lenses, utilizing 720 International’s patented FlipTop™ system to make lens changing easy. These polarized impact resistant lenses cut glare, so optical performance is enhanced by eliminating off-axis prismatic mistakes. For the frame, the patented CVS™ venting system was built-in, to allow proper airflow and prevent fogging. Finally, water is prevented from obstructing vision due to a seal, created with the rubber upper bridge and an adjustable strap which strengthens the seal and prevents loss.