Be prepared to snap into action whenever, wherever with the REI CPR mask. Mask offers a 6 x 6 in. barrier and a 1-way valve and filter to protect the rescuer and the victim during cardiopulmonary resuscitation CPR. 2cm airway tunnel allows the rescuer to perform proper CPR on children and adults. Packaged in a convenient pouch with a key ring, the mask can be used as a key chain or clipped off to a belt loop so its always at the ready.