How can you be sure that you have donned your mask correctly?With the new patent pending Force8™ PressToCheck™ filters you can instantly check that you have the correct seal every time.Award winningWinner of the BSIF Product Innovation Award.ComfortFIT IT!Don the Mask - Put the straps and harness over your head and pull the straps to a suitably tight and comfortable fit.PRESS IT!PressToCheck™ - Press the front and backs of both filter covers together to stop air from entering through the filters.CHECK IT!Inhale - No air should come through the mask. Adjust the mask and repeat until it doesn't. Release when seal is made.