These are replacement filters for the AirTrim cold weather mask, sold separately. There are three different models, which allow different volumes of airflow. This is a pack of 2 filters.
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Race Filter: Highest airflow, lowest resistance and least warming for high-intensity activity.
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Sport Filter: Medium airflow and resistance, warms air significantly and is used for light to moderate intensity exercise.
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Asthma Filter: Lowest airflow and highest heat recovery. For those with Asthma, or for use in cold temperatures at low intensity levels.
Filters should be dried completely after each use. With adequate care, each filter should last for 20-30+ sessions. Airtrim Mask comes with the sport filter installed and a spare asthma filter.