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『“Restore your own breath” is a keyword and a joint development by industrial/academic/governmental organizations.

 

“ReBNA”, it is a mask-type training gear for nasal breath.

By creating two separate spaces, inhaling and exhaling, in an airtight mask, inhaling will take place only from the nose and exhaling only from the mouth.

 

It is only a nasal respiration training mask with an air-resist valve in order to minimize demerits of mouth respiration and increase nasal breathing instead.