Better Breathers(tm) are mainly applicable for: dusty environments oversensitivity to animal allergic substances sensitivity to automotive exhaust fumes sensitivity to tobacco smoke air-conditioned rooms sensitivity to most other substances which cause allergic reactions helping prevent snoring aiding in freer breathing during strenuous activities These filters (CE labeled) have a dust cleaning action (0.1 micron) but they offer no protection against the breathing in of toxic gases. Our Better Breathers(tm) have an excellent preventive action in different sports activities. The choice will depend on the environment. They eventually can be put in the nose without filters and then slightly 'clicked' forward, by wich the nose cavities are enlarged and the oxygen intake is raised remarkably. The filters can be 'perfumed' easily for different purposes (e.g. in less pleasantly smelling rooms). Remedial products can be used on the white filters too instead of applying these into the nasal cavities. To insert Better Breathers(tm)just push the Better Breather(tm) into both orifices and against the inside wall. CAUTION!!! 1) Better Breathers(tm) *DO NOT PROTECT AGAINST POISONOUS OR TOXIC GASES, FUMES, VAPORS, ETC.* 2) Better Breathers(tm) SHOULD BE KEPT OUT OF THE REACH OF CHILDREN.