The HiTurbo CPR Face Shield Mask features a one-way valve which enables the rescuer to perform first aid safely. It is crafted from durable nylon pouch and polyethylene fibers, measuring 1.96" by 1.96" to fit in small compartments like glove compartments, boats, purses, and keychains. The lightweight and compact design of this multi-functioning tool makes it the ideal addition to any first aid kit.