- Proprietary 3Mâ„¢ Cool Flowâ„¢ exhalation valve provides a cooler and drier wear by reducing heat and moisture build up on the inside of the respirator - Made from 3Mâ„¢ Advanced Electret Filter Material for effective filtration with low breathing resistance - Coloured straps for easy identification of protection class (blue for P2) - Does not contain components made from natural rubber latex