An invertible mask that's half the size of all leading pocket masks and fits both adult and child with a superior seal of contoured soft medical PVC that conforms to all faces. A one-way valve and filter provide hygienic protection which eliminates transmission of vomitous and contagious diseases. Use a 3M™ Filtrete™ hydrophobic filter for maximum protection placed above the valve to prevent fluid contamination from patients. Large airway opening prevents back-pressure. Mask is clear with a valve, allowing excellent observation of interior.