To make masks more comforatable, convenient and keep mask straps off your ears. Convenience - it's always there, easy on and easy off by unhooking one strap. In and out of the car, stores, restaurants, school ect. in a breeze. Better fit/Comfort - with the adjustable snap you can customize your "one size" mask to better fit your face. Fashionable - a fun way to accessorize your outfit and express yourself. One more way to make a fashion statement with your mask.