The Pro Sport anti-dust mask requires a full face helmet to function. The Pro Sport anti-dust mask Defies gravity! No straps! Only a tether to keep it with you. The new mask is designed to work with the newer model, closer fitting helmets of today. It's lighter, malleable, structure frame allows it to unbelievably stay in the front of your full face helmet. It can be removed and replaced in seconds, with your helmet still on. This new collapsible design will work even with a street helmet. The Pro Sport anti-dust mask is great for all MX and Dual Sport helmets. Keep your Pro Sport anti-dust mask on you and use it only as needed. Leave it in for hours. You can hardly tell you have it on, while on the move. Breathe free at a fast paced breath. Made from the highest quality materials with our own state of the art precision equipment right here in the USA.