F&P SleepStyle Auto CPAP Machine ThermoSmart Heated Hose Tubing 14301 iVAPS initiates a type of Size:7.5 iVAPS initiates a type of secondary pressure which takes advantage of Vsync leak compensation to better create patient ventilation synchrony The outer gel flap conforms to the user's face while the thicker inner wall molds to the face to support and stabilize the seal It includes an internal heated coil to help prevent "rainout" and improve humidification levels during sleep apnea therapy F&P SleepStyle ThermoSmart CPAP Hose Tubing with AirSpiral technology has an insulating spiral and a heating spiral that work together to minimize condensation and reduce heat loss during sleep apnea therapy