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[uv / polarized tac lens]uv400 protection coating blocks 100% of harmful uva, uvb & uvc rays up to 400nm, restores true color, enhance contrast, anti-glare to make your eyes more comfortable. tac lens are extremely impact-resistant, scratch-resistant, lightweight and durable. [lightweight pc frame]the cool black unbreakable sunglasses are made of premium pc, ultra light weight, flexible, durable, produced through swiss technology as a resilient thermoplastic memory material. non-slip nose pads are comfortable & skin-friendly. unique flex hinges design, don't press head. [perfect all rounder]the square frame design is classic & everlasting fashion style for men. moreover, it adds more sport elements. it's choice for driving, fishing, climbing, running, hiking, cycling, skiing, boating or other outdoor activities..syi