COSTA DEL MAR Zane Sunglasses, Matte Black CR-39 plastic lenses are impact and scratch resistant with exceptional clarity, contrast, and definition. Gray lenses with 12% VLT (Visible Light Transmission) maintain color saturation and natural contrast in medium to bright sun conditions&#8212;perfect for sports on water and land. 100% polarization efficiently eliminates reflected glare and reduces visual fatigue. 100% UV protection from the suns harmful rays. Durable nylon frame with Hydrolite to grip ears and temples. Stainless steel hinges resist corrosion. Flexible hinges keep their shape and adjust perfectly when worn. Wire core temples provide stability and durability thats easily adjustable with a simple tweak. Nose pads that grip even better when you sweat. All Costa Del Mar Sunglasses are hand assembled in Florida.