AirTrim Cold Weather Mask Replaceable Filters (2-Packs)

Find the right amount of filtering for your training/racing effort level and comfort. These two-pack filters allow you to switch out filters from your AirTrim mask so you can breathe comfortably with your preferred heating vs. airflow level. Filters come with five levels of filtering. The rolled corrugated plastic in the filters is coloured white or blue. White filtering plastic offers more heating and less airflow, while blue plastic filtering material offers more airflow. The Racing Filters have varying amounts of white vs blue filtering material. The Asthma filter is the most restrictive, warming the air the most. It is made of tightly packed white filter material. The Racing3 filters offer the highest airflow and are entirely made from the blue filtering material. The other filters are in stages between those two filters, becoming progressively more open until the Racing3. A study at the University of Montreal found that the AirTrim mask is excellent for training and low-exertion activity. They recommend using it for warming up and easy effort activities. Once you have a race or interval session, it is recommended to remove the mask to allow unrestricted oxygen flow. To read the whole article, head to this link: https://nature-humaine.ca/2023/02/air-trim/. With our experience here at Skiwax.ca, we agree with this assessment of the AirTrim Mask. The mask is great for warm-ups, easy skis, and cool-downs, so removing the mask or having the Racing 2 or 3 filter for more strenuous efforts will make you feel and perform better.