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Their description here: amzn.to/3RQ0QjF says: UV400 PROTECTION: These sunglasses blocks 100% harmful UVA & UVB Rays to protect your eye well when you are doing outdoor sports , such as golf, cycling, driving, fishing, skiing, running, tennis, racing etc.
At first, i go for cost because i beleive that is where quality is. Then i tried rockbros. And it rocks. I thought being cheap way cost below oakley, would also the quality. And to my surprise, it is not. And so from that time onwards, i prefer rockbros.
There's a reason brands pay millions on advertising... to get you to pay 5 times more than a lesser known brand that is 20% less quality not 80% less quality. But someone who forks out $175 on glasses isn't ever going to admit they overpaid. Regarding durability, you can replace the lesser price ones 3 times and still have saved money. And by that time the higher priced ones will probably have scratches anyway. Most importantly, everyone's head/nose isn't the same. Get the cheapest that fits well.