This tire is amazing because of how well they roll and the puncture protection that is offered. Customers have ridden years on these tires without even one flat! Schwalbe says this about the Plus tires:
Punctures become obsolete with the MARATHON PLUS! The SmartGuard layer made from a flexible, special rubber offers particular resistance to shards of glass and flints. Even a thumbtack cannot penetrate this protective layer. The SmartGuard belt does not increase rolling resistance. The MARATHON PLUS rolls as easily as a tire without protection.
Please note that this clearance tire is the older Marathon Plus HS348 profile and compound preceding the current 2014 model.