Originally published: 28 January 2026
Last reviewed for compliance: 28 January 2026
High-visibility (hi-vis) clothing is essential personal protective equipment (PPE) across industries where workers are exposed to moving vehicles, plant, or low-visibility conditions — including construction, logistics, roadworks, rail, utilities, and warehousing.
In the UK, the primary standard for hi-vis PPE is EN ISO 20471. This guide explains:
- What EN ISO 20471 is
- Who it applies to
- Employer responsibilities under UK regulations
- How compliant garments are assessed
- How to choose suitable hi-vis clothing for different environments
If you are specifically looking for a breakdown of Class 1, Class 2 and Class 3 hi-vis clothing, read our dedicated guide: Hi Vis Classes Explained.
This article is written for Health & Safety managers, compliance teams, procurement professionals and employers responsible for PPE selection.
What Is EN ISO 20471?
EN ISO 20471 is the international standard specifying requirements for high-visibility clothing intended to make the wearer conspicuous against complex backgrounds in hazardous situations.
The standard covers:
- Fluorescent materials for visibility in daylight and low light
- Retroreflective materials for visibility in dark conditions when illuminated
- Garment design and placement rules for reflective bands and visible surface area
- Certification and labelling requirements for compliant garments
Under UK health and safety law, hi-vis clothing identified as necessary by a workplace risk assessment must meet EN ISO 20471.
👉 View EN ISO 20471 compliant hi-vis workwear
https://hivizworkwear.net/collections/hi-vis
Who Must Comply With EN ISO 20471?
EN ISO 20471 applies wherever a risk assessment identifies that workers must be visible to vehicles, plant, machinery, or other hazards in low-light or high-risk environments.
This is typically relevant where:
- Workers are exposed to moving vehicles or plant
- Tasks are carried out in poor light, adverse weather, or visually complex backgrounds
- Workers must be visible from distance and multiple angles
Typical sectors include:
- Construction and infrastructure
- Roadworks and highways
- Rail infrastructure and maintenance
- Warehousing and logistics
- Utilities and public services
Employer Duties (UK)
Under the Personal Protective Equipment at Work Regulations, employers must:
- Assess the risks and determine whether hi-vis PPE is required
- Provide suitable compliant PPE free of charge
- Ensure garments are maintained, inspected and replaced when necessary
- Train workers in the correct use, storage and care of PPE
How Hi-Vis Classes Work Under EN ISO 20471
EN ISO 20471 defines three garment classes based on the minimum amount of visible fluorescent material and retroreflective tape built into the garment. The higher the class, the greater the visibility.
Rather than covering every class in detail here, we have created a dedicated guide for that topic:
👉 Read: Hi Vis Classes Explained: Class 1, Class 2 & Class 3
In summary:
- Class 1 is the lowest level of visibility, used only in lower-risk and controlled environments
- Class 2 is commonly used in moderate-risk environments such as logistics, utilities and site support roles
- Class 3 provides the highest level of visibility and is used in high-risk environments such as roadworks, night operations and higher-speed traffic zones
If you are unsure which class is required, always base the decision on a formal risk assessment and, where needed, take advice from a specialist supplier.
What Makes a Garment EN ISO 20471 Compliant?
For hi-vis clothing to be compliant, EN ISO 20471 requires more than just bright fabric. A compliant garment must meet technical requirements in four areas:
1. Fluorescent Background Material
Fluorescent fabrics, usually in yellow or orange, improve visibility in daylight and low-light conditions.
2. Retroreflective Tape
Reflective tape returns light towards its source, helping the wearer remain visible in dark conditions when illuminated by headlights or work lights.
3. Garment Design & Placement
The standard specifies:
- Minimum surface areas for fluorescent and retroreflective materials
- Correct positioning of reflective bands around the torso and, where applicable, the limbs
- Garment construction that preserves required visibility from multiple angles
4. Certification & Labelling
Each compliant garment must:
- Be tested by an accredited body
- Carry the EN ISO 20471 label with its class designation
Common EN ISO 20471 Compliance Mistakes
Even when compliant garments are available, organisations can still fail compliance in practice.
❌ Supplying non-certified hi-vis clothing
Fashion or promotional hi-vis garments without EN ISO 20471 certification do not count as compliant PPE.
❌ Selecting the wrong class for the environment
Using a lower class than the risk assessment requires can increase risk and may fail inspection or audit requirements. See our separate guide: Hi Vis Classes Explained.
❌ Personalisation that reduces visibility
Incorrect logo placement can reduce visible fluorescent or reflective areas below compliance thresholds.
❌ Failure to replace worn garments
Faded fabric, damaged seams, or worn reflective tape can invalidate the compliance of a garment.
Branding Hi-Vis Clothing Without Affecting Compliance
Branded hi-vis clothing can remain compliant, but logo placement must be handled correctly. Branding should not reduce required reflective bands or fluorescent background material below the standard’s minimum thresholds.
This is particularly important for:
- Left chest and right chest logos on polos and jackets
- Back prints on hi-vis vests and outerwear
- Sleeve branding near reflective tape
Useful related guides:
- Workwear Logo Placement Guide
- Print vs Embroidery: Which Branding Method Is Right for Your Workwear?
Hi-Vis Clothing for Specific Risk Environments
Traffic Management & High-Risk Worksites
For roadworks and complex traffic environments, compliance may require higher visibility garments, additional PPE, and careful assessment of traffic speed, lighting and exposure.
👉 View Traffic Management Hi-Vis Options
https://hivizworkwear.net/collections/traffic-management
Rail Infrastructure & Specialist Standard
Rail work often requires additional specification beyond EN ISO 20471 due to sector-specific rules and garment requirements.
👉 Shop Hi-Vis Workwear Rail Specification
https://hivizworkwear.net/collections/hi-vis-workwear-rail-specification
Choosing the Right EN ISO 20471 Hi-Vis Workwear
To select compliant hi-vis garments:
- Base decisions on a formal risk assessment
- Determine the required class for the environment
- Choose garments that suit the working conditions and tasks
- Check that branding or personalisation does not affect compliance
- Ensure proper maintenance, replacement and training
When in doubt, work with a specialist supplier who understands both technical standards and operational site requirements.
EN ISO 20471 Compliant Hi-Vis Workwear
Start with the right garments:
👉 Browse compliant Hi-Vis Workwear
https://hivizworkwear.net/collections/hi-vis
Related reading:
- Hi Vis Classes Explained: Class 1, Class 2 & Class 3
- Workwear Logo Placement Guide
- Print vs Embroidery Guide
If you need help specifying the correct class, garment type or personalisation for your workforce, speak to a workwear specialist before placing an order.