Gerson half mask respirator compares to 3M in quality, safety, and durability but at a much lower price! I have available size large only. Most adult men can wear a size medium or size large, and most adult women can wear a size small to medium. These are adjustable.
These respirators can be fitted with your choice of interchangeable filters to accommodate your exact need. I have on hand XP100 Pancake/disc style filters which offer HEPA rated filtration and G03 OV/AG cartridge style filters which offer organic vapor and acid gas protection.