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A winter or snow tyre has a self-cleaning tread design that effectively cleans itself of snow as it drives. This allows the tyre to keep better traction when in snow. A non-winter tyre is likelier to pack snow into the tread when driving. A winter tyre has a much softer rubber compound, which means the tread remains soft in cold temperatures. As the temperature drops, a summer tyre, and to some degree, an all-season tyre, will become firmer and, as a result, offer less grip. Due to the softer tread, a winter tyre will wear quicker and is unsuitable for summer use.