Are these really carbon fiber?

The listed frame material is metal, so treat the carbon-fiber name as branding. The weight of 0.74 oz is real, but the frame is not a carbon composite.

Do they block UV and cut glare?

Yes. The lenses are polarized and rated UV400, which blocks UVA and UVB and reduces glare from water, snow and the road.

The lens is 6.8 cm wide, the bridge is 19 mm and the arms are 13.5 cm, with a full-coverage rectangular wrap. That suits medium to larger faces; narrow faces may find them loose.

What comes in the box?

Expect the sunglasses and a soft pouch or cloth. A hard case and spare lenses are not listed, so budget for a case if you need one.

Are they worth it over a name brand?

If you want light, polarized, UV400 lenses at a low price and do not mind replacing them when scratched, yes. For optical clarity and durable hinges, a premium pair is better.

When is the best time to buy?

Sunglasses like these are discounted most in late summer and around Black Friday. Check the price history before buying; the gap between stores is often larger than the seasonal drop.

BIRCEN Carbon-Fiber Polarized Sunglasses for Men

Last price we saw

$30.48at eBay, last seen Oct 31

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Our take on the BIRCEN Carbon-Fiber Polarized Sunglasses for Men

The BIRCEN Carbon-Fiber Polarized Sunglasses are a lightweight wrap-around pair for men, sold mainly on price. The listed specs mix things up: the frame is described as metal, not carbon fiber, and the lenses are tri-acetate cellulose rather than glass or polycarbonate. At 0.74 oz they are among the lightest sunglasses you can buy, which is the real selling point. They are a budget pick, so expect budget build quality.

Best forShoppers who want polarized, UV400 lenses for under a few dollars a pairRunners, cyclists and drivers who want a light wrap-around frameBuying several pairs to keep in the car, bag and garage