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Ive seen other “Heat Exchange” face masks. Why is Psolar better?

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Ive seen other “Heat Exchange” face masks. Why is Psolar better?

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Personal Respiratory Heat Exchange (PHRE) devices have been around since the 1800’s. The first patent was in 1898. Since that time the evolution of the technology has been to make them simpler and more affordable. Psolar utilizes a simple lightweight and affordable PHRE.

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