Class 1 vs Class 2 vs Class 3 Hi Vis Workwear: Which One Do You Actually Need?

If you have ever stood in front of a rack of hi vis workwear wondering why some jackets cost three times more than others, the answer usually comes down to one thing: the class. Hi vis clothing in the UK is not one-size-fits-all. There are three distinct classes each with different levels of protection, different minimum material requirements, and different appropriate uses and choosing the wrong one can leave you non-compliant, unsafe, or turned away at the site gate.

This guide breaks down exactly what Class 1, Class 2, and Class 3 hi vis means, how the standard works, and which class you need for your specific role.

What Determines the Class of Hi Vis Workwear?

All certified hi vis workwear in the UK is measured against EN ISO 20471, the internationally recognised standard for high-visibility clothing. This standard sets out minimum requirements for two key properties:

• Fluorescent background material — the bright yellow or orange fabric that makes you visible in daylight

• Retroreflective material — the silver strips that reflect light back towards its source, making you visible in low light and darkness

The more of each that a garment contains, the higher the class and the greater the protection it offers. The Health and Safety Executive recommends that workers always wear the class appropriate to the risk level in their environment.

The Three Classes at a Glance

This table alone tells you a great deal. A Class 3 garment has nearly six times the fluorescent coverage of a Class 1 — making it dramatically more visible across a wider range of conditions and distances.

Class 1 Hi Vis: The Basics

What Is Class 1 Hi Vis?

Class 1 hi vis is the entry-level category of high-visibility clothing under EN ISO 20471. It contains the smallest amount of fluorescent and retroreflective material and offers the lowest level of visibility protection available in the certified range.

When Is Class 1 Hi Vis Appropriate?

Class 1 is suited to environments where:

• Vehicle speeds are low (typically under 25 mph)

• The worker is not in close proximity to moving traffic

• There is additional background contrast that helps make the worker visible

• Risks are intermittent rather than constant

Typical examples include warehouse operatives working in clearly marked pedestrian zones, car park attendants, or retail workers directing customers in off-road car parks. It is generally not appropriate for construction sites, road work, or any environment with fast-moving vehicles.

Class 1 Hi Vis Garments

Because the minimum material requirements are modest, Class 1 garments are often lightweight and simple — thin vests, basic waistcoats, or accessories like reflective belts. They tend to be used for short-duration, lower-risk tasks.

Class 2 Hi Vis: The Most Common Choice

What Is Class 2 Hi Vis?

Class 2 hi vis is the most widely worn category of hi vis workwear across the UK. It provides a significantly higher level of visibility than Class 1 and is appropriate for a broad range of medium-risk working environments.

When Is Class 2 Hi Vis Required?

Class 2 is the standard requirement for the majority of UK construction sites, general roadside work where traffic speeds are moderate, and environments such as:

• General construction and groundwork

• Utility and infrastructure maintenance

• Delivery and logistics drivers who leave their vehicle

• Airport ground crew

For most workers sourcing hi vis workwear for everyday site use, Class 2 is the practical minimum. It is the class most frequently specified in site induction documents and PPE policies across the UK.

Class 2 Hi Vis Garments

Class 2 garments include vests with broader fluorescent panels, hi vis jackets, hoodies, polo shirts, and bodywarmers. The key is that the garment must achieve the minimum 0.50 m² fluorescent area and 0.13 m² of retroreflective banding — which typically means coverage around the torso and at least partial sleeve or shoulder banding.

Aviator London's range of Class 2 certified hi vis hoodies and jackets are built to meet EN ISO 20471 requirements whilst remaining comfortable enough for a full shift in variable UK weather conditions.

Class 3 Hi Vis: Maximum Visibility Protection

What Is Class 3 Hi Vis?

Class 3 high visibility clothing represents the highest level of protection available under EN ISO 20471. It requires the greatest surface area of both fluorescent and retroreflective material, and crucially, it must include coverage of the arms — not just the torso. This is what distinguishes Class 3 from Class 2 in practical terms: a Class 3 garment must make the wearer conspicuous from all angles and at greater distances.

When Is Class 3 Hi Vis Clothing Required?

Class 3 hi vis clothing is mandatory in the highest-risk environments, including:

• Work on or near motorways, dual carriageways, and A-roads with traffic speeds above 50 mph

• Railway and trackside maintenance

• Airport tarmac and runway operations

• High-risk construction sites near live traffic

• Any environment where workers must be visible at extended distances in all weather conditions

The UK Government's guidance on working safely near traffic makes clear that proximity to fast-moving vehicles demands the maximum level of visibility protection available.

Class 3 Hi Vis Garments

To achieve Class 3 certification, garments must typically be full jackets with hi vis sleeves rather than vests or simple bodywarmers. Some Class 3 ratings can also be achieved through a combination garment for example, a Class 2 jacket worn over Class 1 hi vis trousers provided the combined coverage meets the total material minimums. However, single-piece Class 3 garments remain the clearest and most reliable route to compliance.

Class 1 vs Class 2 Hi Vis: How to Choose

When weighing up class 1 vs class 2 hi vis, the question to ask is not "what is the minimum I can get away with?" but rather "what does the risk level of my environment genuinely require?"

For the vast majority of tradespeople, contractors, and site workers in the UK, Class 2 is the appropriate baseline. Class 1 is best reserved for very specific low-risk scenarios.

Does Hi Vis Class Affect the Colour?

No, class and colour are separate considerations. EN ISO 20471 permits fluorescent yellow, fluorescent orange-red, and fluorescent red as background colours. Yellow is by far the most common choice in the UK for general construction and road work, whilst orange is frequently used in specific industries such as rail or to distinguish between different teams on the same site.

Retroreflective strips are almost always silver regardless of the garment colour.

How to Check Your Hi Vis Is Genuinely Certified

Genuine EN ISO 20471 certified hi vis workwear will carry a label that states the standard and the class clearly. Look for:

• EN ISO 20471 printed on the internal label

• The class number (1, 2, or 3)

• A UKCA mark (for UK-sold goods) or CE mark

• The certification body's identification

If a garment does not have this information on the label, it has not been independently certified — and it should not be relied upon for workplace safety.

Aviator London stocks a full range of certified EN ISO 20471 hi vis workwear across all classes, with clear labelling so you know exactly what you are buying.

Frequently Asked Questions

1. What is the difference between Class 2 and Class 3 hi vis?

The key difference is the amount of high-visibility material and where it is placed. Class 2 hi vis covers the torso with fluorescent and retroreflective banding, whilst Class 3 high visibility clothing additionally requires coverage of the arms, ensuring the wearer is conspicuous from all angles and at greater distances. Class 3 is mandatory near motorways, railways, and in other high-speed traffic environments.

2. Can I wear Class 1 hi vis on a construction site?

In most cases, no. The majority of UK construction sites require a minimum of Class 2 hi vis workwear, and many specify Class 3. Class 1 is generally insufficient for environments where vehicles or plant machinery are operating, as it does not provide enough visibility at the distances and speeds involved.

3. Is a hi vis vest always Class 2?

Not necessarily. A vest's class depends entirely on the surface area of fluorescent and retroreflective material it contains. Some vests are only Class 1 certified. Always check the label for the EN ISO 20471 class rather than assuming based on garment type.

4. Can you combine garments to achieve a higher class?

Yes, in some circumstances. Wearing a Class 2 jacket over Class 1 hi vis trousers can achieve a combined Class 3 rating, provided the total fluorescent and retroreflective coverage meets the Class 3 minimums. However, single-piece certified Class 3 garments are often simpler to manage for compliance purposes.

5. How often does hi vis workwear need to be replaced?

There is no fixed legal replacement schedule, but hi vis workwear should be replaced when the fluorescent material has visibly faded, retroreflective strips are cracked, peeling, or dirty, or the garment is torn or damaged. Faded hi vis that no longer meets the visibility standard it was certified to provides false assurance workers should inspect their garments regularly and replace them as needed.

Choosing the right class of hi vis workwear is one of the simplest and most important safety decisions any worker or employer can make. Get it right and you significantly reduce the risk of an entirely preventable accident. Browse Aviator London's full collection of EN ISO 20471 certified hi vis workwear from everyday Class 2 hoodies to heavy-duty Class 3 jackets — and make sure your team is properly protected on every shift.