When a tyre needs to perform in winter, two markings come up: M+S and the three-peak mountain snowflake. They are often treated as interchangeable, but they are not. One is a manufacturer's claim; the other is a tested result. For proven winter grip, the snowflake is the marking that counts.
The core difference
The distinction is simple once it is clear:
| Marking | M+S | Three-peak snowflake (3PMSF) |
|---|---|---|
| Stands for | Mud and Snow | Tested snow traction |
| Behind it | Self-declared by the maker | Independent, standardised test |
| Proves grip? | No | Yes, for snow |
| Found on | Many all-season, 4x4 and touring tyres | Winter and capable all-season tyres |
M+S describes a tread pattern the maker considers suitable for mud and snow, with nothing measured to confirm it. The snowflake is only granted after the tyre passes a defined snow-traction test, which is why it is the one to trust.
Why the snowflake wins
Because any tyre can be labelled M+S, the marking has become almost meaningless as a guarantee of winter performance, it sits on genuine all-season tyres and on ordinary tyres alike. The snowflake cannot be applied without passing the test, so it draws a clear line between tyres that have demonstrated snow grip and those that merely claim a suitable pattern.
In practice, a capable winter or all-season tyre will carry both markings. M+S on its own should be read as "may help a little", not as proof of winter ability.
What this means for UK drivers
In the UK there is no law requiring winter tyres, so the markings are about capability rather than compliance at home. The picture changes for driving abroad: several European countries with winter-tyre rules recognise the three-peak snowflake, and M+S alone is being phased out or no longer accepted in some of them. Anyone driving to continental winter regions should look for the snowflake and check each country's rules before travelling.
A third marking: Ice Grip
There is also a separate Ice Grip marking, a mountain pictograph containing an icicle, for tyres tested specifically for grip on ice, mainly Nordic studless tyres. It is uncommon on UK roads, where the three-peak snowflake is the marking most drivers will encounter, but it is worth recognising as distinct from both M+S and the snowflake.
The simple rule
For anything beyond the occasional cold morning, look for the three-peak mountain snowflake. M+S is a useful clue, but only the snowflake confirms a tyre has actually been tested in snow. The two markings, the snowflake's tested standard and the lower speed ratings common on winter tyres, all form part of reading a tyre built for the cold. When buying winter or all-season tyres, a snowflake-rated set is the one for genuine cold-weather grip, and the snowflake-marked options are easy to pick out by size when you shop the tyre sites, Tyres.co.uk among them.
From the workshop: customers ask which winter badge to trust, and the answer never changes. M+S is a label; the three-peak snowflake is a pass mark. If only one of them is on the tyre and it is M+S, treat it as a summer tyre that has been hopeful about itself.
Common questions
What is the difference between M+S and the snowflake symbol?+
M+S (Mud and Snow) is self-declared by the manufacturer with no test behind it. The three-peak mountain snowflake is awarded only after a tyre passes an independent snow-traction test. For proven winter grip, the snowflake is the marking that counts.
Which marking should I look for on winter tyres?+
Look for the three-peak mountain snowflake. It confirms tested snow performance. A capable winter or all-season tyre will carry both the snowflake and M+S; M+S on its own does not prove winter ability.
Does M+S count for driving in Europe?+
In several European countries with winter-tyre rules, the three-peak snowflake is the marking that is recognised, and M+S alone is being phased out or no longer accepted. Anyone driving abroad in winter should check the snowflake and the rules for each country.
Is there a marking for ice as well as snow?+
Yes. A separate Ice Grip marking, a mountain pictograph with an icicle, applies to tyres tested specifically for grip on ice, mainly Nordic studless tyres. It is uncommon in the UK, where the three-peak snowflake is the marking most drivers will see.