Winter tyres are are first choice for ice and snow as they offer plenty of traction. Winter tyres are made of a rubber compound that remains flexible even in cold weather and can interlock with the ground. This is achieved, for example, by a higher silica acid content. For recognising at first glance which tyre is suitable, winter tyres - but also all-season tyres - have a M+S label. M+S stands for mud and snow. M+S tyres usually have large grooves in the tread, in which the snow can be collected so the tyre contact with the ground is kept up.
The M+S tyre branding is not legally protected. Therefore each tyre manufacturer can label a tyre even if it is not suitable for winter - unfortunately this is not unusual. Motorists should watch for the "snowflake"❄ symbol as such tyres have passed tests regarding their winter suitability and meet certain minimum requirements. Especially in snowy regions these tyres are strongly recommended for safety reasons.