Not to quibble, but this is not a valid statement.

Most brands, including ours produce a wide range of tires with varying levels of puncture protection. The Supreme tires are on the upper end of this range, but there is no such thing as a pneumatic tire that is "flatproof". Our Marathon Plus tire is as close as you'll come. The penalty is weight.

Heading out now, I'll elaborate more tomorrow.

Cheers,

gb