Improved with DOLOMITE optional clogging test. Comfort: Vertical Flat Folded, each mask inside individual polybag for easier storage. Exhalation valve for lighter breathing resistance. Adjustable nose clip for optimised fit. Dolomite optional clogging test (D) to provide more comfortable breathing and longer lasting filtration performance, flexible shape which allows the mask to be folded flat and high performance exhalation valve to reduce heat and provide comfort when used in hot and humid conditions. Ultrasound welded elastic straps, ideal for all day use. Individually wrapped inside hygienic polybag.