After watching some detective show about fibers that were left behind at a 5-minute crime scene. I got to thinking that the poly balaclava that I wear over the face for 4mo. out of the year may be the cause of nasal congestion while biking.
Some of those fibers are probably going into the lungs. No I'ain say'n my lungs are 'full of it' but just wondering if a wool balclava would be healthier.