A waterproof hi-vis coat and a waterproof hi-vis jacket aren't the same thing. The coat is longer — mid-thigh to knee. The jacket stops at your hip. Get it wrong and you've bought too much bulk, or left your lower half soaked. Our complete guide to waterproof hi-vis jackets covers the full standards picture. This article answers one question: coat or jacket?
What is the difference between a hi-vis coat and a jacket?
The workwear industry uses "coat" and "jacket" interchangeably. That's not helpful. Here's the real difference.
A hi-vis coat is longer than hip length. Most fall mid-thigh to just below the knee. Common styles include parkas, storm coats, and 4-in-1 systems. They give you more coverage. Think of a highways worker standing at the roadside in driving rain — a coat keeps their thighs dry.
A hi-vis jacket is hip-length. It stops at or just below your waist. Common styles include bomber jackets, softshells, and fleece-lined shells. You move more freely in one. A bricklayer climbing scaffolding needs that movement.
Both can carry EN ISO 20471 hi-vis certification. Both can be waterproofed to EN 343. The length is the only real difference — but that difference matters for your job.
Waterproof vs water resistant: what actually keeps you dry?
Not every hi-vis coat or jacket sold as "waterproof" actually is. Two terms get mixed up constantly.
Water resistant means the fabric has a DWR coating. DWR stands for durable water repellent. It makes rain bead off the surface. Fine for a light drizzle. Give it heavy, sustained rain and it soaks through. There are no sealed seams. Zip joins and pocket openings let water in.
Waterproof means something much more specific. The fabric uses a membrane or laminated coating to block water. All seams are taped or welded shut. The garment is tested and certified to BS EN 343:2019 — the UK standard for rain protection in workwear PPE. If it doesn't carry that mark, "waterproof" is just a marketing word.
For full-day outdoor work in UK conditions, you need the real thing. Taped seams. EN 343 certification. Anything less and you'll be wet through by mid-morning.
What does EN 343 mean on a hi-vis coat or jacket?
Look inside any certified waterproof hi-vis garment and you'll find an EN 343 label with two numbers. Per SATRA Technology Centre — the UK's leading PPE test body — those numbers tell you everything about the garment's rain protection.
The first number is the waterproof rating, scored 1 to 4. Higher is better.
- Class 1 — light shower protection only. Tested on new fabric, no pre-treatment.
- Class 2 — moderate rain, tested after real-world wear simulation (abrasion, flexing, washing).
- Class 3 — heavy rain, long hours outdoors. Higher pressure threshold after pre-treatment.
- Class 4 — the highest rating. Added in the BS EN 343:2019 update. Fabric and seams both tested after pre-treatment. Requires withstanding 20,000 Pa of water pressure — equivalent to very heavy or prolonged storm conditions.
Some older product pages still list Class 3 as the top. It isn't. Class 4 is.
The second number is breathability — also 1 to 4. Higher means more moisture gets out. That matters for active workers. A garment that traps sweat leaves your workers just as wet, but from the inside out.
The breathability rating is based on how easily water vapour passes through the fabric. Class 3 breathability means no time limit on wearing at temperatures of 20°C or below. Class 1 means you should only wear it for 75 minutes at 20°C before the wearer starts to overheat. That's a real limit for active outdoor workers on a full shift.
EN 343 Class 3:3 is the sweet spot for most outdoor roles. Very good waterproofing with good breathability. If your workers are standing still in very heavy rain — traffic management, for example — look for options rated Class 4 on the first number. Just check the second number too. A 4:1 rating keeps rain out but gives your worker no breathability. They'll overheat fast.
EN 343 is a bolt-on standard. The HSE's guidance on high visibility clothing is clear: PPE must be suitable for the risk, the job, and the wearer. EN 343 pairs with EN ISO 20471 on most certified hi-vis waterproof garments. You need both marks on the label.
Which should you pick for your job?
The HSE is direct on this point: the darker the conditions or the higher the risk, the more coverage your worker needs. Here's how to match garment style to job role.
| Job role | Coat or jacket? | Why |
|---|---|---|
| Highways / traffic management | Coat | Stationary for long periods. Full thigh coverage. Heavy rain exposure. |
| Roadside maintenance | Coat | Road splash, standing water. Longer coverage protects your lower body. |
| Active construction / groundworks | Jacket | Bending, climbing, lifting. Hip-length allows full movement. |
| Rail / trackside | Coat or long jacket | EN ISO 20471 Class 3 required. Orange colourway. RIS-3279-TOM for Network Rail trackside. Check with your principal contractor. |
| Utilities / cable laying | Jacket or 3-in-1 | Mix of active and static work. A 3-in-1 gives flexibility across conditions. |
| Warehouse / yard work | Jacket | Indoor/outdoor mix. Hip-length avoids snagging on racking. |
One more thing worth noting: the HSE also flags that coats can be too warm in summer months. In warmer conditions, a shorter jacket with a waterproof layer may suit better. PPE must be right for the wearer, not just the risk.
What to check before you buy
Don't just buy on looks or price. Run through this list before you order.
- EN ISO 20471 class on the label — Class 3 for highways, rail, and high-risk construction. Class 2 for lower-risk or indoor-outdoor roles.
- EN 343 rating — Look for 3:3 or better for active outdoor work. Consider Class 4 on the waterproof number for very heavy or sustained rain exposure. Don't pick a 4:1 for active workers.
- Taped or sealed seams — No taped seams means water gets in at every stitch line. Non-negotiable for genuine waterproofing.
- Detachable hood — Useful where workers wear hard hats. A fixed hood that won't fit over a helmet is no use at all.
- Storm flap over the zip — A bare zip is a leak point. The flap covers it.
- Adjustable cuffs — Loose cuffs let cold water run up the sleeve.
- Wash cycle rating — Look for 25 or more certified wash cycles. Hi-vis brightness must hold after washing, per EN ISO 20471.
- UKCA or CE mark — Confirms the garment meets UK/EU PPE regulations. Both marks are valid in Great Britain for now. Check the HSE's clothing guidance for current requirements.
Leo Workwear Buckland Hi Vis Softshell Jacket Yellow EcoViz Waterproof
Portwest T740 WX3 Winter Jacket Waterproof Insulated Work Coat
Beeswift 4 in 1 Hi-Vis Jacket Orange Class 3 Waterproof Workwear
Pulsar Protect Arc Waterproof Storm Coat ATPV 23 Electric Arc Protection
Frequently asked questions
What is the difference between a hi-vis coat and a hi-vis jacket?
A hi-vis coat is longer than hip length — typically mid-thigh to below the knee. A hi-vis jacket is hip-length. Both can carry EN ISO 20471 hi-vis certification and EN 343 waterproof ratings. The length is the key difference, and it affects how much coverage and freedom of movement you get.
Do waterproof hi-vis coats need to be EN 343 certified?
Not legally — EN ISO 20471 covers the hi-vis visibility requirement but doesn't mandate waterproofing. However, for outdoor work in UK conditions, a garment tested to BS EN 343:2019 is strongly recommended. Without that certification, "waterproof" on the label is just a marketing claim, not a tested standard.
What EN 343 class do I need for outdoor UK work?
For most sustained outdoor roles, look for EN 343 Class 3:3 as a minimum. The first number is waterproofness, the second is breathability — both rated 1 to 4, with 4 being highest. Class 4 waterproofness was added in the BS EN 343:2019 update and is the top rating for the heaviest rain. Don't choose Class 4:1 for active workers — maximum waterproofing but no breathability means workers overheat fast.
Are waterproof hi-vis coats warmer than jackets?
Not automatically. Length alone doesn't determine warmth. What keeps you warm is the insulation layer inside, not the outer shell. A longer coat does reduce wind chill around the thighs, which helps in exposed, stationary work. But an insulated jacket with a thermal mid-layer will outperform a non-insulated coat in cold conditions.
Can I wear a hi-vis jacket under a waterproof coat?
Yes — but only if the outer coat also carries EN ISO 20471 certification. The hi-vis standard requires a minimum area of fluorescent and reflective material visible on the outer garment. If the waterproof coat covers your inner hi-vis jacket completely, the inner garment's certification doesn't count. Always make sure the outermost layer carries the UKCA or CE mark and the EN ISO 20471 class rating.
Still not sure which option suits your team? Read our complete guide to waterproof hi-vis jackets for a full breakdown of EN ISO 20471 classes and EN 343 ratings. Our wet weather work gear guide covers the full PPE picture for outdoor workers. And if you're kitting out for colder months, the hi-vis winter clothing guide is worth a read too. You can also browse our full range of hi-vis jackets and coats to compare options directly.