What feature on the head provides a textural contrast to the wiry body coat?

Answer

A distinct, appealing topknot made of softer hair.

The hair on the skull is softer and forms a distinct, appealing topknot, which contrasts nicely with the hard texture covering the rest of the body.

What feature on the head provides a textural contrast to the wiry body coat?
AustraliaDogcharacteristicbreedTerrier