Each mask comes with inserts for to insert extra filter protection and it should be replaced every 7 days or 48-72 hours if heavy usage. To wash mask, remove the filter and then put the mask in soap diluted with warm water. Gently knead, clean and dry for a few hours.
Stretch out the linen, iron when damp (do not iron the elastic) and leave to dry naturally. Avoid tumble drying.
Each mask comes with a complimentary multi-layer PM2.5 filter. Additional filter can be purchase here (https://www.double-woot.com/filter-inserts)
*Fits adults and kids ages 5 and up.