How to Choose Sunglasses for Outdoor Activities

A good pair of sunglasses does more than make bright sunshine more comfortable. Suitable sunglasses help protect your eyes from ultraviolet (UV) radiation, reduce glare and improve visual comfort during outdoor activities.

Whether you're walking in the countryside, hiking in the mountains, travelling abroad or spending time at the beach, choosing the right sunglasses involves more than selecting a frame style or lens colour.

In this guide, we'll explain UV protection, lens categories, polarised lenses, frame designs and the features worth considering before buying sunglasses for outdoor use.

Why Wear Sunglasses Outdoors?

The sun produces ultraviolet radiation that can damage your eyes as well as your skin.

Prolonged UV exposure is associated with several eye conditions, including cataracts and damage to the surface of the eye.

Sunglasses with suitable UV protection can help reduce this exposure.

They can also make outdoor activities more comfortable by reducing bright light and glare, particularly around reflective surfaces such as water, sand and snow.

However, sunglasses vary considerably in their protective properties. Dark lenses alone do not guarantee effective UV protection.

What Does UV400 Mean on Sunglasses?

UV400 indicates that sunglasses are designed to block ultraviolet radiation at wavelengths up to 400 nanometres, covering UVA and UVB radiation.

When choosing sunglasses, look for products clearly labelled as providing:

• UV400 protection.
• 100% UVA and UVB protection.
• Appropriate compliance with recognised sunglasses safety standards.

Check the manufacturer's product information rather than relying on lens colour or appearance.

Are Dark Sunglasses Better at Blocking UV?

Not necessarily.

Lens darkness controls how much visible light passes through the lens, while UV protection depends on the lens material and any protective treatments.

A lighter lens can provide excellent UV protection, while a dark lens without suitable UV filtering may offer inadequate protection.

Always prioritise verified UV protection.

Understanding Sunglasses Lens Categories

Sunglasses are commonly classified into lens categories based on the amount of visible light they transmit.

These categories help indicate the brightness conditions for which the lenses are intended.

Category	Visible Light Transmission	Typical Use
0	80–100%	Very light tint or fashion use
1	43–80%	Low sunlight and overcast conditions
2	18–43%	Moderate sunlight
3	8–18%	Strong sunlight and general outdoor use
4	3–8%	Exceptional glare, such as high mountain conditions

These categories describe visible light transmission, not the amount of UV protection.

Important: Category 4 sunglasses are not suitable for driving or road use because they transmit too little visible light.

Which Lens Category Is Best for Walking?

For many daytime walking and hiking activities in bright sunshine, category 3 lenses can be a practical choice.

Category 2 lenses may be more suitable in moderate light, while lighter lenses may be preferable in duller conditions.

Consider the expected light levels, terrain and whether you'll be moving between exposed and shaded areas.

Which Sunglasses Are Best for Mountain Walking?

Mountain environments can expose walkers to strong sunlight, particularly at altitude and around snow.

Choose sunglasses with reliable UV protection and sufficient coverage around the eyes.

In exceptionally bright mountain conditions, specialised high-protection eyewear may be appropriate.

Remember that category 4 lenses must not be used for driving.

What Are Polarised Sunglasses?

Polarised sunglasses contain a filter designed to reduce certain types of reflected glare.

Glare can occur when sunlight reflects from relatively flat surfaces, including:

• Water.
• Wet roads.
• Glass.
• Snow and ice.
• Other reflective surfaces.

Polarised lenses can make these reflections less distracting and improve visual comfort in suitable conditions.

Are Polarised Sunglasses Better?

Polarised sunglasses can be particularly useful for activities involving reflected glare, such as coastal walking, fishing and travelling near water.

However, they aren't automatically the best choice for every activity.

Polarisation can make some electronic screens difficult to read and may affect how certain reflective surfaces appear.

For example, depending on the screen and viewing angle, a phone, dashboard display or navigation device may appear unusually dark.

Check whether polarised lenses suit the equipment and activities you regularly use.

Do Polarised Sunglasses Offer Better UV Protection?

Not automatically.

Polarisation reduces particular types of glare, while UV filtering protects against ultraviolet radiation.

These are separate characteristics.

Choose sunglasses with appropriate UV protection whether or not the lenses are polarised.

Polarised vs Non-Polarised Sunglasses

Feature	Polarised	Non-Polarised
Reduces reflected glare	Yes, for certain reflections	Generally less effective
UV protection	Depends on lens specification	Depends on lens specification
Electronic screen visibility	Can cause viewing difficulties	Generally fewer polarisation-related issues
Suitable for outdoor activities	Yes, depending on use	Yes, depending on use

Neither type is universally better. Choose according to your environment, activities and personal preferences.

Does Sunglasses Lens Colour Matter?

Lens tint can affect how colours, contrast and brightness appear.

However, tint colour is not a reliable indicator of UV protection.

Grey Lenses

Grey lenses generally reduce overall brightness while maintaining a relatively neutral appearance of colours.

They are commonly used for general outdoor activities.

Brown and Amber Lenses

Brown and amber tints can alter colour perception and may make some differences in contrast more noticeable.

Some people prefer these tints for walking and outdoor recreation.

Green Lenses

Green-tinted lenses can reduce brightness while retaining a reasonably natural appearance of many colours.

Yellow and Orange Lenses

Yellow and orange tints are sometimes used in lower-light conditions to alter perceived contrast.

However, they are not necessarily suitable for strong sunlight, and their effectiveness depends on the lens specification and conditions.

Choose tint based on comfort and intended use rather than assuming one colour is best for everyone.

What Are Mirrored Sunglasses?

Mirrored sunglasses have a reflective coating on the outside of the lenses.

Depending on their construction, this coating can help reduce the amount of visible light passing through the lens.

Mirrored lenses are often used in bright conditions, but the appearance of the coating does not indicate the level of UV protection.

Check the lens category and UV specification separately.

What Are Photochromic Sunglasses?

Photochromic lenses change their tint in response to certain light conditions, usually becoming darker when exposed to ultraviolet radiation.

They can be convenient when moving between different environments.

However, their response varies between products and may be affected by temperature and the UV-blocking properties of vehicle windscreens.

Not all photochromic lenses become sufficiently dark for strong sunshine, so check their stated transmission range and intended use.

Choosing the Right Sunglasses Frame

Frame design affects comfort, coverage and how securely sunglasses remain in place.

Wraparound Sunglasses

Wraparound frames curve around the sides of the face.

They can help reduce sunlight entering from the sides and may provide a more secure fit during movement.

These designs are often useful for walking, hiking and other active pursuits.

Full-Frame Sunglasses

Full-frame designs surround the lenses and are available in many shapes and sizes.

They can provide good everyday comfort, although coverage varies considerably.

Half-Frame and Rimless Sunglasses

These designs may provide a lighter or less obstructed feel.

However, durability and protection depend on the construction, lens shape and overall coverage.

How Should Sunglasses Fit?

Comfortable sunglasses should stay securely in position without excessive pressure.

Check the following:

• Temple arms: They should fit comfortably around the sides of your head.
• Nose bridge: The glasses should rest securely without slipping or creating pressure points.
• Lens coverage: The lenses should provide suitable protection for the eyes and surrounding area.
• Movement: The sunglasses should remain reasonably stable when walking or looking down.
• Compatibility: Consider whether they fit comfortably with a sun hat or other equipment.

Frames that are too tight can become uncomfortable over long periods, while loose frames may slip during activity.

Are Larger Sunglasses Better for Sun Protection?

Larger lenses and well-designed wraparound frames can reduce the amount of sunlight reaching the eyes from different directions.

However, overall protection also depends on lens UV filtering and how the sunglasses fit your face.

A large frame with poor UV protection is not necessarily a better choice than a smaller frame with suitable lenses and good coverage.

What Are the Best Sunglasses for Hiking?

For hiking, prioritise a balance of UV protection, secure fit and comfort.

Useful features include:

• 100% UVA and UVB protection.
• A lens category suited to the expected conditions.
• Good coverage around the eyes.
• A lightweight, comfortable frame.
• Secure positioning during movement.
• Durable construction.

For long days outdoors, comfort is particularly important because poorly fitting sunglasses may become distracting or uncomfortable.

What Are the Best Sunglasses for Beach Holidays?

Beaches can be especially bright because sunlight reflects from sand and water.

Look for effective UV protection, suitable lens darkness and good coverage.

Polarised lenses may be helpful for reducing reflected glare from water.

Remember that sunglasses should be used alongside sunscreen, a suitable sun hat and shade.

What Sunglasses Should You Wear for Driving?

For driving, sunglasses must allow enough visible light through the lenses to maintain safe vision.

Category 4 lenses are unsuitable for driving or road use.

Some lenses may also carry restrictions on use in low light or at night.

Polarised lenses can reduce some road glare, but they may affect the visibility of certain dashboard displays and other surfaces.

Always follow the manufacturer's stated driving restrictions and ensure your vision remains suitable for the conditions.

Are Expensive Sunglasses Better?

Price alone does not determine UV protection.

Suitable sunglasses at different price points can provide effective UV filtering.

More expensive designs may offer differences in materials, lens coatings, comfort, durability or optical performance, but these features should be assessed individually.

Prioritise clear UV protection specifications, appropriate lens categories and comfortable fit.

How to Look After Your Sunglasses

Proper care can help maintain lens clarity and extend the useful life of your sunglasses.

• Store them in a suitable protective case.
• Rinse away abrasive sand or grit before wiping the lenses.
• Use a clean lens cloth and appropriate cleaning products.
• Avoid placing lenses face-down on rough surfaces.
• Don't leave sunglasses exposed to excessive heat, such as on a vehicle dashboard.
• Check frames and lenses regularly for damage.

Scratched or damaged lenses can affect vision and comfort. Replace sunglasses when damage compromises their safe use.

Common Mistakes When Choosing Sunglasses

Choosing Dark Lenses Without Checking UV Protection

Lens darkness and UV filtering are different properties.

Assuming Polarised Means UV-Protected

Polarisation reduces certain reflections but does not automatically provide UV protection.

Ignoring Lens Categories

Different lens categories suit different brightness conditions, and category 4 lenses are unsuitable for driving.

Choosing Frames That Are Too Loose

Poorly fitting sunglasses can slip during walking or other activities.

Overlooking Side Coverage

Sunlight can reach your eyes from the sides, particularly in exposed or reflective environments.

Choosing Style Over Comfort

Sunglasses that look appealing but feel uncomfortable may be unsuitable for prolonged outdoor use.

Frequently Asked Questions

What Does UV400 Mean?

UV400 indicates protection against ultraviolet radiation at wavelengths up to 400 nanometres, covering UVA and UVB radiation.

Are Polarised Sunglasses Better for Walking?

They can be useful where reflected glare is a problem, but they aren't essential for every walking activity.

What Lens Category Is Best for Hiking?

Category 3 is often suitable for bright daytime conditions, while lighter categories may be more appropriate in moderate or low light.

Can You Drive in Category 4 Sunglasses?

No. Category 4 lenses transmit too little visible light and are unsuitable for driving or road use.

Do Darker Sunglasses Block More UV?

Not necessarily. UV protection depends on the lens specification rather than its visible darkness.

Are Wraparound Sunglasses Better?

Wraparound designs can reduce sunlight entering from the sides and may provide a secure fit, making them useful for many outdoor activities.

What Colour Sunglasses Are Best?

There is no universally best tint. Grey, brown, green and other colours affect brightness and colour perception differently, so choose according to your preferences and intended use.

Do Sunglasses Protect Against Sunburn Around the Eyes?

Larger lenses and good coverage can help shade the skin around the eyes, but sunglasses don't replace other suitable sun protection measures.

Final Advice: Choosing the Right Outdoor Sunglasses

The most important feature of any pair of sunglasses is effective UV protection.

Look for 100% UVA and UVB protection, choose an appropriate lens category and select a frame that fits comfortably and provides suitable coverage.

Polarised lenses can be useful for reducing reflected glare, while wraparound frames may offer additional protection from sunlight entering at the sides.

Whether you're walking, hiking, travelling or relaxing at the beach, the right sunglasses should combine eye protection, comfort and practical performance.

Explore our sunglasses collection or visit our Sun Protection department for more advice and equipment.