Of course like other spacers nostrils it facilitates the passage of air which is nice but tolerance to this one when doing sport is very average, it irritates the lining of the nose and the more he does want not in place when running. I rather use the night and there it turns non-irritating and hold in place (unlike "respifacile" but the "clipair" do the same thing with a larger airflow and greater comfort. There two in the blue box (small size, a large pink) comes with a single small box in handy plastic storage to transport the object. In the end a good value, service, price.