How Breathable Induction Sealing Works The breathability feature of a breathable membrane is the basic theory behind breathable induction sealing. Micropores that are small enough to prevent the invasion of foreign body such as bacteria and dust and just large under a few Nanometers to permit free exchange of gas molecules such oxygen, nitrogen, hydrogen or carbon dioxide. Sealing occurs by melting the sealing material using induction heating to achieve a strong seal, while preserving the microporous structure of the breathable membrane.