Unlike humans, horses can only breathe through their nose. During exercise when horses begin to breathe hard the soft tissues overlying the nasal passages are sucked in, reducing the airway diameter. This reduction in diameter causes greater resistance to airflow into the lungs. FLAIR Strips are proven to reduce airway resistance during exercise. By reducing airway resistance during exercise, FLAIR Strips are a horse care product that helps prevent fatigue related injuries, helps protect the lungs from injury and promotes optimal athletic performance.