Designed to move with you. Engineered Airknit delivers advanced comfort, superior breathability and lightweight protection. The most advanced technical textile ever developed for a mask. Specific zones of high airflow are made possible through a combination of engineered knitting and compression forming. The result is our lightest weight, most breathable mask ever. Includes 4 replaceable filters. Multiple Layer Protection With its innovative 3D aerodome shape, moisture-wicking performance, and superior weight to comfort ratio the Active Mask is specifically designed for high-intensity activity. Engineered for ideal airflow with a 3D shape that stands off the face to create a canopy of clean air and balanced air circulation. The replaceable insert filter blocks bacteria, dust & particulates with an electrostatically charged, double TorayMicron nano-filter core layer. The unique outer layer protects from airborne contaminants, with the inner layer providing a skin-friendly and hypoallergenic environment.