A 3-peak mountain snowflake rating indicates that the tire is approved to do well in severe snow conditions. This can show up on all-terrain and all-season tires as well, as long as they meet some of the right testing criteria. If you see an all-terrain tire that has this symbol on it, you’ll notice it has superior performance and traction on heavy snow and ice compared to other tires that do not have this kind of rating. If you live in an area that has a lot of heavy snow and ice, you should look for this rating to keep safe on the road.