M+S and the snowflake symbol are not the same thing, and the difference is that one of them has been tested. Plenty of all-season and even some summer-biased tyres carry M+S. Far fewer carry the snowflake. If you are choosing tyres for genuine winter use, or driving to the Alps, that distinction is the one that matters.
What the snowflake actually certifies
The three-peak mountain snowflake symbol shows a small mountain outline with a snowflake inside it. A tyre may only carry it if it has passed a defined snow traction test, measuring acceleration performance on packed snow against a reference tyre.
It is a pass or fail. That makes it a meaningful, comparable marking rather than a marketing description, and it is why regulators reference it.
Why M+S is weaker
M+S stands for mud and snow. Crucially, there is no performance test behind it in the way there is for the snowflake. It has historically been applied on the basis of tread geometry, which means a manufacturer can mark a tyre M+S because of how it looks rather than how it performs in snow.
In practice many all-season tyres carry both markings, which is the combination you want. A tyre carrying M+S alone tells you comparatively little about its cold-weather grip. Our guide to all-season tyres covers where that category genuinely helps in a UK winter.
Does it matter in the UK?
There is no UK legal requirement to fit winter or snowflake-marked tyres at any time of year. UK law sets a minimum tread depth of 1.6mm across the central three-quarters of the tread and requires tyres to be fit for purpose and free from defects, which is set out on GOV.UK. Nothing in that mandates a seasonal tyre.
Where it matters is performance rather than legality. Winter and snowflake-marked tyres use compounds that stay flexible at low temperatures, so their advantage appears in the cold and wet as well as in snow. Whether that is worth it for your mileage and location is the question we work through in are winter tyres worth it in the UK.
Driving in Europe is where it counts
Several European countries operate seasonal requirements or conditional rules requiring suitable winter equipment in wintry conditions, and the trend has been to specify the snowflake symbol rather than accept M+S alone. Requirements vary by country and can change, so the practical advice is to check the rules for each country on your route before you travel rather than assume.
The GOV.UK foreign travel advice page for each country sets out its driving rules, including any winter equipment requirements.
Summer, M+S, snowflake and winter: how the markings compare
The marking on the sidewall tells you what a tyre has been tested for, not what season it is sold as, and the two do not always line up. This table sets out the four cases you will meet:
| Marking | What it means | Tested? | Typically found on | Meets European winter rules? |
|---|---|---|---|---|
| None | A summer tyre | Not for snow | Most tyres fitted from the factory in the UK | No |
| M+S only | Mud and snow, based on tread geometry | No | Older all-season tyres, many 4x4 and van tyres | Increasingly no; being phased out as acceptable |
| 3PMSF (with or without M+S) | Passed a standardised snow traction test | Yes | Modern all-season tyres and all winter tyres | Yes, where a marking is required |
| 3PMSF plus ice grip symbol | Passed the snow test and an additional ice braking test | Yes | Nordic-type winter tyres, rare in the UK | Yes |
The important row is the second one. A tyre marked M+S alone looks the part but has proved nothing, and it is the marking most likely to leave you on the wrong side of a border check or, more practically, sliding on a cold morning you thought you were equipped for.
Modern winter tyres carry the snowflake, but the snowflake does not make a tyre a winter tyre. A 3PMSF all-season tyre has passed the same snow test as a winter tyre, but a dedicated winter tyre goes further in cold-weather compound and tread design. Our guide to summer vs winter tyres sets out the difference.
Where the snowflake appears on the tyre label
On the EU tyre label revised in 2021, the snowflake is printed on the label itself, below the three main grades. Great Britain still uses the older label format, which has no snowflake, so on tyres sold here check the sidewall as well.
The label shows wet grip and rolling resistance from A to E, external noise in decibels, and then, where the tyre qualifies, one or both of two pictograms: the three-peak mountain snowflake for severe snow, and a separate ice-grip symbol for tyres that pass an additional ice braking test.
The ice symbol is aimed at Nordic markets and you will rarely see it on tyres sold in the UK.
Where a tyre comes with the EU label, it is a quick way to compare two all-season tyres; on the older label, check the sidewalls. Our guide to the EU tyre label explains the grades in full.
Two caveats. The label is a legal requirement on new tyres, so an online listing or a quote that does not show one is a reason to ask.
The snowflake on the label is a pass or fail; it does not tell you how far past the pass mark a tyre went, which is where independent tests come in. Tyre-safety charity TyreSafe publishes seasonal guidance on what to look for.
Snowflake tyres and the rest of your winter kit
The marking on the sidewall is one part of being ready for a UK winter, and on most days it is not the part that matters most. Cold and wet are the conditions you will actually meet, and those reward pressure, tread and condition as much as compound.
- Pressure. Tyre pressure falls as temperature drops, so the first cold snap of autumn routinely lights TPMS warnings and leaves tyres under-inflated. Check monthly and after any sharp change in the weather.
- Tread. A 3PMSF tyre worn near the legal minimum has lost most of the biting edges that earned it the marking. Measure it; the legal floor is 1.6mm across the central three-quarters, per GOV.UK.
- Condition. Cold hardens rubber, and a tyre that is already cracking will get worse over a winter.
- Technique. No marking replaces gentle inputs, longer following distances and reading the road. The Highway Code advises against driving in snow and ice unless the journey is essential.
Put together, a set of 3PMSF all-season tyres with good tread and correct pressure covers the large majority of UK winter driving. Dedicated winter tyres earn their keep where you regularly see settled snow, live up a hill, or drive early on untreated rural roads. Our guide to preparing tyres for winter pulls the checks together.
Checking what you already have
Have a look at your sidewalls. Some drivers on all-season tyres already have the snowflake and do not know it, and some who believe they have winter tyres have M+S-only rubber. Check all four, because a car that has had tyres replaced one at a time can easily end up with a mixture, which gives you neither consistent behaviour nor a clean answer at a border.
If you want a second opinion, ask the fitter to check condition, tread and markings while they are with you. We can also supply and fit winter or all-season tyres at your home or work.
