This Honeywell North 5500 Economy Half-Mask Respirator is the perfect solution for an affordable, occasional-use respirator. Respirator includes replaceable organic vapor cartridges, plus N95 pre-filters and caps. Available sizes: S (for very petite adults, children), M (fits 80% of population), L (people with large head/facial features). These are guidelines to assist with your sizing decision. There is no easy way to spell out the sizing on these 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. Replacement Organic Vapor cartridges are item 218205 and replacement N95 filters are item 41297. Honeywell North 5500 Half-Mask Respirator Kit