In Quebec, where snow tires on all four wheels are required by law from December 15 to March 15, the only tires that are legal are those with the "Snowflake" logo. An aggressive tread does not always make a good snow tire. Many performance snow tires have what look to be not much different from four-season tires. The difference is in the rubber compound that stats pliant at cold temperatures. At very cold temperatures M&S tire treads can become so hard that you might as well be driving on plastic tires like on a kid's electric car. 90% of our winter driving is on bare roads where hard rubber will have no grip in the cold