Abstract: A respirator system and hygroscopic hose used in the system is disclosed. The system includes a means for generating a flow of air, a hose connected to the generating means and a mask adapted to be secured to a patient. The mask connected to the hose such that air generated by the generating means passes through the hose to the mask. The hose is a hygroscopic hose made up of a thermoplastic polyurethane. The thermoplastic polyurethane permits water formed by the respiration of the patient to permeate through a sidewall of said hose from an inner surface of the hose to an outer surface of the hose. The sidewall of the hose does not permit air generated by the generating means to pass through the sidewall.