Snow / winter tires typically feature softer rubber so that the tire can grip the snow and ice.  On top of the soft rubber, you typically have extra snipes in the threading which increase the grip.  Snow tires are normally labeled with a picture of mountain and snowflakes on the packaging which indicates that the tire has been approved by the American Society for Testing and Materials. For lighter cars, studded snow tires increases the friction between your vehicle and the road and also helps prevent the vehicle from sliding in extreme winter conditions.  We can help you pick the snow / winter tires for your vehicle.