Aside from solid rubber, no tire is impervious to puncture. The marathon supreme is a nice balance between toughness/durability and weight/suppleness. Obviously some people want more toughness, while others want lighter/more supple rubber. The toughest tire I know of would be the Marathon Plus. Some of the Specialized Armadillo tires are known to be tough, also. It should be noted that no tire protects against rim-side punctures or tube defects.
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