As the name suggests, a dirt trapper mat mainly collects coarse dirt and mud. Its stiff fibres ensure that most of the dirt is brushed off from the soles of your shoes even before you enter your home. A good dry-running mat, on the other hand, consists of a pile with soft fibres that absorb water quickly and well. In short, the dirt-trapping mat outside of the entrance ensures that as much dirt as possible is removed, while the dry-running mat inside of the entrance absorbs any remaining moisture and dirt.