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What's up with "M+S" and the "mountain/snowflake" symbol on the sidewall?
Many people think these mean the same thing - that a tire is good in snow and other wintry conditions. But they actually mean completely different things. A sidewall mark of M+S (or M/S, M&S, MS) means that you have an all-season tire that has been approved for use in
mud and snow by the Rubber Manufacturer's Association (RMA). These tires will provide traction in
light snow, but we wouldn't want to be caught in a blizzard with a set of M+S tires.
The mountain/snowflake symbol (shown below) on the sidewall means that a tire has been approved for "severe snow service" by the RMA. These tires are tested to be sure they meet the RMA's standards for snow traction.