The replaceable filter is tested for Particle Filtration Efficiency (PFE) and Bacteria Filtration Efficiency (BFE) and is made from 3 layers of non-woven materials. The efficiency is lab certified, PFE ≥95% BFE ≥98%. See test report
The materials used for the feat.MASK are approved and contain no harmful chemicals. See test report
The yarns have been treated with an antibacterial agent that prevents bacteria to flourish in the fiber. Lab tests confirm a bacteriostatic activity up to 99.9% after washing. The antibacterial treatment lasts at least 20 washes. See test report