Snow tires are manufactured with more natural rubber and less synthetic rubber. The benefit is that snow tires remain flexible at colder temperatures, and are thus able to grip the road better than regular street tires. The key is their cold weather interaction. These are not mud tires that are designed to take you off-road at a tractor pull. These are tires that are designed to make driving safer during the colder months of the year. Auto tires that have a higher concentration of synthetic rubber become stiff and unbending during cold weather driving. 

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