These versatile sunglasses are ready for sand, surf or open water with their polarized polycarbonate lenses.The Panamanians have a name for a popular baitfish they use—Caballito or "little horse." Anyone who knows horses knows that even little ones are exceptionally strong. Costa's Caballito Polarized Sunglasses embody that character with their extremely durable, heavy-duty TR-90 nylon frames that are made with resin from the castor plant. This bio-based resin offers a 70% reduction in emissions over petroleum-based resin, helping to reduce the overall carbon footprint. 100% polarized, scratch-resistant 580P polycarbonate lenses ensure reflective glare and eye strain is minimized or eliminated altogether. Hydrolite nose pads and flexible integral hinges will keep them firmly on your face whether you're on the hunt for GTs or just a prime spot on the beach. Although, if you want to be extra sure they don't end up in the drink, a neoprene retainer or leash (sold separately) is inexpensive insurance. Blue mirrored lenses are the way to go for offshore use with bright, full sun on open reflective water.580P Polycarbonate LensesPolarized to eliminate reflective glare and reduce eye strainLightweight, yet durableImpact resistantC-Wall scratch-resistant, smudge-free barrierMirrored lenses deliver superior contrast and color while enhancing visual acuity100% protection from UV lightAbsorbs harmful high-energy blue light (HEV)Cuts haze and blur for greater clarityFilters out harsh yellow lightEnhances reds, greens and bluesSharp contrast with high definitionTR-90 Nylon FramesCastor oil is used to make the bio-based plastic resinBio-based resin offers a 70% reduction in emissions over petroleum-based resinReduced overall carbon footprintFlexible, yet tough and durableLightweightHold their shape under harsh conditionsResistant to heat and coldHydrolite hypoallergenic rubber nose pads prevent slippingCorrosion-resistant, flexible, stainless steel integral hinges keep their shapeKey FeaturesComfortable medium fit580P polycarbonate polarized lensesHeavy-duty TR-90 nylon framesIncludes hard case and cleaning