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Foldable sunglasses are useful if you often cycle, travel or want to carry sunglasses in your coat pocket or handbag. However, a compact design does not automatically guarantee comfort, lens quality or durability. Hinges that become stiff, an oversized frame or insufficient information about UV protection can leave you disappointed with your purchase after a short time.
This practical buying guide compares the most important features of folding sunglasses. You will also find several popular options for different uses.
Sunglasses may fold down small yet still feel heavy or uncomfortable to wear. Check the weight, frame width and shape of the nose bridge. Lightweight sunglasses made from TR90, for example, can be comfortable for everyday use, but the fit is still a personal matter.
Pay attention to the hinges, too. With a folding model, you move the arms more often than with standard sunglasses. A design with clear care instructions and a protective case can help prevent scratches and unnecessary strain.
“Sun protection” or “anti-glare” does not tell you exactly what protection you are getting. Look for a specific mention of UV400 protection. This designation refers to protection against ultraviolet light up to 400 nanometres. Also check whether the product information clearly states what type of lens has been used.
Anti-reflective sunglasses can reduce distracting reflections, but this is different from UV protection. According to the product information for some models, both features are combined, so assess them separately.
Polarised sunglasses can reduce reflections from water, wet roads and glass, for example. This makes them interesting for fishing, boating, golf and driving. However, a polarised lens is not automatically photochromic.
According to the product description, photochromic sunglasses adjust their tint based on UV exposure. In a car, the effect may be more limited because the windscreen blocks some UV light. For driving, it is therefore sensible not to rely solely on the term “photochromic”.
First check whether sunglasses with UV400 protection are explicitly listed in the specifications. Then check the lens category, if one is provided. A dark-tinted lens can be comfortable in bright light, but tint and UV protection are two different features.
For cycling and other outdoor activities, impact resistance, a secure fit and a protective case are also important. Do not use sports sunglasses as a substitute for certified eye protection when carrying out work involving hazards such as grinding or machining.
TR90 is a thermoplastic material often used for lightweight, flexible frames. The product information for the Beneunder FD421 states a weight of 26 grams and a folded thickness of approximately 35 millimetres. This makes the model practical as travel sunglasses, provided the dimensions suit your face.
Always compare the frame width, arm length and bridge width. A universal size will not suit everyone equally well. Soft nose pads or adjustable arms can help make sunglasses more comfortable to wear for longer periods.
An anti-reflective coating can reduce reflections. Some models also mention a scratch-resistant or oleophobic coating, which makes fingerprints less noticeable. These features are useful, but coatings can be damaged by harsh cleaning products or dry, rough cloths.
Use a microfibre cloth and keep the sunglasses in the supplied case. Fold the frame gently in the intended direction. This reduces pressure on the hinges and prevents the lenses from coming into contact with hard objects.
Why it suits this profile: A practical model for everyday use, travelling and driving. According to the product information, these sunglasses have a TR90 frame, nylon lenses and a weight of 26 grams.
The product description mentions UV400 protection, an anti-reflective coating and a foldable design. However, check beforehand that the oversized frame suits your face.
26 grams, TR90 frame, tri-fold design and a choice of several colours.
Why it suits this profile: A classic Boston shape with extra attention to adjustability and everyday comfort. According to the product information, the arms can be adjusted to three positions.
The description mentions UV400, anti-reflective, oleophobic and scratch-resistant coatings. This makes the lens specifications clearer than those of models with only a general sun protection claim.
TR90 frame, nylon lenses, adjustable arms and a folded thickness of approximately 1.15 inches according to the product information.
Why it suits this profile: Designed for cycling, fishing, golf, boating and other outdoor activities where reflections can be distracting. This is a pair of sports sunglasses, not industrial eye protection.
The product information lists polarised UV400 lenses, a TR90 frame and a clear replacement lens for overcast conditions.
Polarised lens, replacement lens, protective case and microfibre cloth according to the product description.
We have put together a complete, up-to-date list of products that fully meet these strict selection criteria and the applicable European safety regulations.
That depends on the lens. UV400 protection is important, but it says nothing about reflections, lens colour or suitability in changing light. A polarised lens can reduce reflections. Photochromic lenses may not become as dark in a car because the windscreen filters out UV light. Therefore, check the product information and avoid choosing lenses that are too dark for situations where you need to move quickly between different light levels.
Their lifespan depends on the hinges, frame material, lens coating and how they are used. Fold the sunglasses gently, do not leave them loose in a bag and use a case. Scratches, damaged coatings or a loose hinge are reasons to replace the model. The statutory guarantee is separate from normal wear and tear or damage caused by incorrect use.
Maintenance usually costs very little: a soft microfibre cloth and a protective case are sufficient for everyday use. Avoid hot water, harsh cleaning products and paper tissues. Models with replaceable nose pads or lenses may require additional parts later, so check beforehand whether these are available.
