CPR Micromask™ Setting a new standard, the CPR Micromask™ is a reusable mask with replaceable single-use one-way valve featuring a 3M™ Filtrete™ filter. The seal is made of flexible materials that conform to the victim's face, even in extreme conditions, and the dome is clear for accurate monitoring of the victim. This mask may be used on adults, children and infants, and it folds down to fit in a low profile nylon belt pouch with a pair of nitrile gloves.