The Moldex 7000 Series P100 Half-Mask Respirator features an extra-wide sealing area to give you all-day comfort and protection. Includes one pair P100 particulate respirator cartridges. Size Small (for very petite adults, children). This is a guideline to assist with your sizing decision. There is no easy way to spell out the sizing on respirators. Size medium will fit a majority of men and women. Once you receive your respirator, make sure it fits properly and passes fit testing requirements before using. For size Medium search Item # 214549-M and for size Large search Item # 214549-L. Moldex 7000 Series P100 Half-Mask Respirator Kit