It is recommended that our masks be hand washed using a non-allergenic laundry detergent (not dish washing detergent as many contain natural or synthetic bleach that can fade the mask and possibly negate the anti-microbial action of Aegis). Masks should be allowed to air dry. Regarding our cold weather reversible fleece masks, also hand wash with a non-allergenic laundry detergent and allow to air dry.
How often should they be washed? That question depends on the frequency of use, type of use, and personal preference of the mask wearer. Dust masks used for long periods of time in very dusty environments may need to be washed daily. On the other hand, if the mask is used occasionally, and you dont see any accumulation of dust/debris on the liner, it may only require washing every month or so.
During hot weather, some prefer to wear the mask while damp for a cooling effect. To preserve the Aegis germ-fighting integrity, do not dry clean and avoid chlorine bleaches.