Snow reflects up to 80% of UV rays, and clouds block far less than people assume. Here's the actual science behind why sunglasses are a year-round necessity, not a summer accessory.
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How to Choose Polarized Sunglasses: A Buyer's Guide
Not sure what "polarized" actually means or whether you need it? Here's how polarization works, when it matters, and how to confirm the lenses you're buying are the real thing.