Train, race, and stay active in cold conditions with Airtrim, a cold-weather breathing mask designed to warm and humidify the air you inhale. Using warmth and moisture from your exhaled breath, Airtrim helps reduce airway irritation during winter sports, training, and other high-effort cold-weather activities. Built for athletes and cold-air-sensitive users, Airtrim is commonly used by runners, racers, cross-country skiers, and winter cyclists, as well as by people with asthma, cardiac conditions, or sensitivity to breathing cold, dry air during exertion. Its above-chin design is intentional and performance-driven. Unlike dust, medical, or balaclava-style masks that wrap under the chin, Airtrim is designed to minimize weight, maximize airflow, and allow easy on-off hinging without fully removing the mask. A replaceable filter system helps match different effort levels. This set includes one Asthma/Sport filter for maximum warmth and humidity during lower exertion, plus one Racing #1 filter with lower breathing resistance for higher-intensity activities. Additional Racing filters are available separately. Compact, ultralight, and made from durable foam, Airtrim is built to last for years with regular use and care. Many users reduce glasses fogging by wearing the strap lower on the neck with a snug fit for a better seal. Not a dust or PPE mask.