Choosing folding sunglasses: practical buying tips for style, travel and cycling

Folding sunglasses are handy if you’re often on the go, but not every compact style is automatically a good buy. A pair that fits easily into a jacket pocket, for example, may be less stable, scratch easily or provide too little information about the lenses. There are also things to check before choosing sunglasses for driving or cycling.

Look out for these three common pitfalls:

• Vague UV claims: phrases such as “sun protection” don’t tell you much without a clear UV400 statement or product specification.
• A delicate folding mechanism: multiple hinges are practical, but they need to be opened and closed carefully. Forcing them open or shut can put strain on the frames.
• The wrong fit: lightweight sunglasses can still press on your nose or behind your ears. Check the bridge width and arm length, and look for adjustable nose pads.

Which specifications should you look for?

1. UV400 and lens information

UV400 protection refers to protection against ultraviolet light up to a wavelength of 400 nanometres. Check that this specification is actually included in the product information. According to the product descriptions for several Beneunder models, the nylon lenses block at least 99.8% or 99.9% of UV radiation. This is a manufacturer’s product specification, not a general guarantee for all sunglasses.

The following features are also worth considering for everyday use:

• Anti-reflective coating: can reduce distracting reflections on the lens. The product descriptions for Beneunder FD315 models mention an OAR coating.
• Polarised lenses: can filter glare from wet roads, water and metal surfaces. According to the product information, the Revoray Y1 models use TAC polarised lenses.
• Light transmission: the Revoray Y1 is listed as having visible light transmission of around 15.2%. This is best suited to bright conditions; a lighter lens may be more practical in changeable weather.

Polarised cycling glasses aren’t essential for every situation. If you mainly walk or wear your sunglasses in the car, you may value anti-reflective properties and neutral colour reproduction more.

2. Frame material and weight

TR90 is a commonly used thermoplastic material for lightweight sunglasses. According to the product descriptions from Beneunder and Revoray, it combines flexibility with low weight. However, “TR90” alone doesn’t tell you enough about the fit or hinge quality.

Also consider the overall weight:

• A folding Beneunder FD421 model weighs around 26 grams, according to the product information.
• The Revoray X3 cycling glasses weigh around 30 grams, according to the product description.
• The Revoray Y1 is listed as weighing around 33 grams.

A lighter pair can feel more comfortable on long bike rides, but coverage and stability are just as important. For intensive use, useful details include rubberised arm tips, adjustable nose pads and a secure fit around the eyes.

3. Dimensions, folded size and fit

Compact travel sunglasses should not only fold down, but also be protected when stored. A hard or sturdy case helps prevent scratches and pressure damage. Also check the frame dimensions. A frame width of around 5.7 to 5.8 inches, as listed for several Beneunder models, may suit an average to wider fit, but face shapes vary from person to person.

Cat-eye sunglasses often have upturned outer corners and a distinctive shape. Boston-style sunglasses are rounder and generally easier to pair with different styles of clothing. Oversized sunglasses cover more of your face, but may be too large if the bridge or arm length isn’t right for you.

Recommended models for different users

Ideal for: Budget-conscious beginners

Beneunder FD315-CN204 Cat-Eye Foldable Sunglasses

Why it suits this user: This model combines a distinctive cat-eye shape with a folding TR90 frame for everyday wear, shopping and travel.

How this product avoids the pitfall

The product description specifies UV400 protection, an OAR anti-reflective coating and air-cushion nose pads. This makes the key specifications clearer than they would be on a model with only a general sun protection claim.

Key benefit & features

TR90 frame, five-point elastic hinges, nylon lenses and a frame width of 5.8 inches, according to the product information.

Ideal for: Buyers looking for premium quality

Beneunder Boston-Style Folding Sunglasses FD01h

Why it suits this user: The Boston shape is a good choice if you want an understated, versatile style with easy portability and an adjustable fit.

How this product avoids the pitfall

The product information lists three adjustment positions for the arms and double-hinged nose pads. This gives you more ways to reduce pressure points than with a fixed fit.

Key benefit & features

UV400 nylon lenses with anti-reflective, oil-resistant and scratch-resistant coatings, according to the product description; folded thickness of approximately 1.15 inches.

Ideal for: Specific needs & intensive use

Revoray Cycling Glasses Y1-Black

Why it suits this user: These sports sunglasses are designed for cyclists who need a secure fit, low weight and reduced glare on longer rides.

How this product avoids the pitfall

According to the product information, these glasses have adjustable silicone nose pads, anti-slip sections and weigh around 33 grams. The lenses also have water- and oil-resistant coatings.

Key benefit & features

TAC polarised lenses, UV400 protection according to the product description, around 15.2% visible light transmission and a stated ANSI Z87.1 performance test rating.

Frequently asked questions about folding sunglasses

Are folding sunglasses suitable for driving?

It depends on the lenses and the conditions. A pair with UV400 protection and an anti-reflective coating may be suitable for everyday use, but check that the lens colour and light transmission are right for driving. Strongly polarised lenses can reduce reflections, but always check that you can still see information on your dashboard or screens clearly.

How long do folding sunglasses last?

Their lifespan depends on the hinge mechanism, lens coating and how well they’re cared for. Open and close the glasses gently at the designated folding points. Rinse off dust with water first, then use a soft microfibre cloth. Store them in a case, and don’t leave them under heavy objects or in high temperatures for extended periods.

Are polarised cycling glasses worth the extra cost?

For cyclists who often ride on wet roads, near water or in bright sunshine, polarisation can help reduce distracting glare. If you mainly cycle in cloudy weather, you may get more benefit from a lighter lens, good ventilation and a secure fit. So compare more than just the price: consider UV400 protection, weight, grip and lens coating too.