Many of our Microbe Shield® mask and cold weather mask customers include COPD patients who tell us our masks are ideal for warming up the air when it is cold outside. Individuals who suffer from COPD can be susceptible to asthmatic attacks and other lung/ breathing issues when breathing frigid, cold air. Our double layer fleece masks are adjustable and help to protect your lungs to cold air exposure. In fact, our masks have been recommended by one of the leading COPD publications. They also fit better than most masks while using a nasal cannula.