If you don't mind looking like a comic book villain, try the 3M HF-800 series with p100 filters. The silicone is very comfortable and it has a button for self-f

If you don't mind looking like a comic book villain, try the 3M HF-800 series with p100 filters. The silicone is very comfortable and it has a button for self-fit-test, which allows you to loosen the straps while remaining confident that you are protected. The large amount of filter surface area results in very low breathing resistance, and the exhalation valve improves comfort for extended wear.