Cool Rinse

 The nasal lining and turbinates are highly vascularized, mucus membranes with a large, convoluted surface area. These structures are responsible for conditioning the air you breathe in through your nose on its way to your lungs.

 The flow of chilled liquid into the warmer nasal cavities acts as a heat exchanger. As the chilled liquid moves over the nasal lining, heat is directly removed from the surrounding tissues via conduction and indirectly via convection using the vast capillary network supplying the nose.