In Alberta, an all-season tire should be used in winter only if it displays the three peaks mountain snowflake symbol. An all-season tire which displays this symbol are known as all-weather tires and will perform adequately in snowy conditions. All-season tires without this symbol – even those M+S (mud and snow) certified – will not provide adequate performance in extreme cold conditions. Ideally, winter tires should be used in place of all-weather or all-season tires.