In nature, a King Tide requires the perfect alignment of Earth and moon to create once-in-a-lifetime views and opportunities for watermen. Like their namesake, the King Tide 6 is designed to give you the ultimate advantage on the water. ? ??Made for watermen who demand performance in every sport, the King Tide 6 features a medium wrap with removable side shields for optimal viewing on and off water. Shark-inspired venting achieves a near impossible zero-fog effect. Top of the line sweat management and drains keep your view dry and unobstructed. Non-skid hooding means they stay in place on any surface wet or dry. ? ??All this has made King Tide 6 the crowning achievement of Costa's 40 years on the water, utilizing the research and innovations from every frame that came before it. ? ? Fit & Design: Wide fit sunglasses Medium wrap design with removable side shields Base 6 lens curve for medium coverage that values style but still performs Polarized Blocks 100% of harmful UV rays 580G Lightwave glass lenses offer better clarity and scratch-resistance than polycarbonate lenses 20% thinner and 22% lighter than your average polarized glass, giving you a lightweight and comfortable wearing experience Vented to resist fogging Built-in drainage feature for comfortable sweat management Technology: Costa 580(R) lenses were designed by in-house light spectrum experts to absorb harmful high-energy blue light (HEV), soften harsh yellows, and enhance reds, greens, and blues C-WALL(R) technology has a scratch-resistant molecular bond and repels water, oil, and sweat for easy cleaning Additional Details: Frame width: 137mm Lens width: 58mm