Sunglasses Guides

A few simple habits keep acetate sunglasses clear, shiny and comfortable. Learn the safe way to clean them, what to avoid, how to store them and how to stop the frame losing its shape.

Those numbers inside the arm of your sunglasses tell you almost everything about fit. Learn what they mean, how to measure a pair or your face, and which Yume frames suit smaller or wider faces.

Acetate is the material behind many of the best-looking frames. Find out what cellulose acetate is, how it compares with moulded plastic and metal, its pros and cons, and whether acetate sunglasses are worth it.

Polarised lenses cut reflected glare, but they can make phone and dashboard screens hard to read. Here's how both lens types work, when each one makes sense, and why Yume lenses are non-polarised.

UV400 is the label to look for on sunglasses. Here's what it means, why a dark lens isn't the same as UV protection, and how lens filter categories 0 to 4 tell you how dark a lens is.

Not sure which sunglasses suit you? Learn how to work out your face shape, which frame styles balance round, square, oval, heart and long faces, and how to check the fit before you buy.