As a karate instructor, I do about 2-3 of these sessions per session. The session lasts around 2 hours and includes a lot of anaerobic and aerobic activities. They're good until the internal filter gets sweaty, after which they fail. Replacing with a new mask works. Please note that you should avoid the dryer after washing and dry completely before use, this increases the duration of the effect. I haven't found a better solution for this yet, we're all sweating.
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