What functional distinction exists between the two layers forming the Wirehaired Pointing Griffon's double coat?

Answer

The undercoat is fine and dense for insulation; the outer coat is harsh and wiry for protection and water shedding

The Wirehaired Pointing Griffon possesses a functional double coat composed of two distinct layers designed for protection in harsh environments. The undercoat is characterized as being fine, dense, and soft, serving the critical purpose of providing insulation against cold water and weather exposure. Conversely, the outer coat is described as harsh, wiry, and coarse. This wiry texture is functionally superior for repelling water and safeguarding the dog's skin from physical damage caused by thorns and harsh undergrowth.

What functional distinction exists between the two layers forming the Wirehaired Pointing Griffon's double coat?
characteristicbreedphysicalcoatGriffon