This one-way valve portable Face Shield is easy to carry with you or attach to a medkit bag. It folds into a compact soft pouch with an attached keychain. Less than 2 inches square. Features: One-way unidirectional valve and water filter combine to block fluid and secretions while increasing oxygen concentration. Valves and filters together create a barrier to the rescuer and the patient. Prevents mouth-to-mouth contact and risk of infection or contamination. Quality pouch made from high-quality nylon with hook/loop folding latch CPR Face shield is made from food-grade polyethylene fiber Instructions printed on shield The shield is shaped to fit an adult head and includes ear straps to hold it in place during use. Disposable - One-time use.