About

M21® LLC, a Philadelphia-based startup, is the inventor and producer of a revolutionary new and globally patent-pending mask design that incorporates dual chamber technology for better breathing. M21® is a two-chamber mask that isolates the nose and mouth via an internal barrier, which enables the wearer to better control their breath by inhaling clean air through the nose and exhaling CO2 through the mouth. Recent studies have shown that inhaling one’s own exhaled air within a mask can significantly increase CO2 intake resulting in a number of adverse side effects (headaches, fatigue, hypoxia, hypercapnia, etc.) and a new phenomenon called “Mask-Induced Exhaustion Syndrome”. M21® is designed to significantly reduce the inhalation of recirculated air inside the mask, thereby reducing overall CO2 intake of up to 90% versus traditional masks. For more information please visit www.m21mask.com.