With a durable outer mesh casing, the Arco Premium valved fold-flat FFP3 dust mask is built to last a bit of wear and tear, and neatly folds flat for easy storage. For Comfort, it features a preformed nose bridge so you don't have to keep altering it all day, Plus adjustable straps for the ideal fit around the head. This disposable mask offers respiratory protection against very fine dusts, mists and fumes, and features an exhalation valve that helps to reduce heat and moisture build-up