Bondstreet -Kids2 in each package and 1 filter 100% cotton for easy breathing Interior pocket to insert filter Filter made of 5 layers If using daily, filter should be changed every 3 days If using infrequently, filter should be changed after 5 days Metal string at nose level for better adjustment Adjustable elastics for a better fit Washable and reusable Remove filter before washing Machine wash gentle cycle and hang to dry Not made for medical use. Meets airline