Our Nanotec Masks with KN95 replaceable filters are the highest non-medical standard of masks. Slim lines and breathable fabric make this mask perfect for the gym or everyday use. Comes with 1 replacement filter for superior protection from over 95% of particles and pathogens in the air. Fabric content - Outside fabric: 92% polytester 8% elastane, inside fabric: 100% cotton. Care instruction - Hand wash.