Note: It is recommended that each filter should be replaced every week if used a lot.
Deceptive: there was only ONE (1) extra (1-piece) filter set in each mask, NOT 2 extra filters. Primary design feature of one of the masks is hidden behind breathing valve, NOT how it was shown in the picture. Appears to be sewn off-center which makes the printed word unreadable. Material is quite thin and time will tell if it holds up for the price. Overall, not impressed. NOT worth the price.