BASE CAMP M Cross Dust Mask, Reusable Breathable Comfortable Safety Face Mask for Work with Extra 6 Activated Carbon Filters

I’d like to start by saying I wear these masks daily for multiple hours at a time. I have been buying BaseCamp masks since the beginning of this year 2025. The fires that have crossed much of the Los Angeles area have led me to become hypersensitive to pollen and makes it difficult to breathe with the common N95 masks. These mask in every model so far (I have the N model, and all 3 M models so far) have allowed me to be outside in comfort and they all work so well at filtering pollen. I look forward to purchasing future models as I undergo immunotherapy and be able to go on long walks with my dog thanks to BaseCamp. Great price, amazing durability, easy to clean, replacing filters has gotten smoother with each design and speed of delivery is amazing.

Hace muy bien su filtrado de aire se ajusta muy bien en la cara.la primera vez que la usé me sentí un poco falto de aire pero luego de un rato todo se normalizó creo que fue por lo nuevo de el filtro

Very good mask, great for helping with pollen

I have become very sensitive to sawdust and pollen. It affects my throat. So I've been trying various masks and respirators. If your concern is fine particles, this BASE CAMP mask is well worth a try. It fit my face fine and is better at blocking dust than my $165 respirator.The exhalation valve on my well-known name-brand $165 respirator is a thick rubber flap which makes a less than perfect seal so that dust and pollen get into your airway when you breathe in. I had to attach a piece of N95 mask over the exhalation valve to fix that problem on my expensive respirator, but then it steams up fairly quickly. By contrast, the exhalation valve on this BASE CAMP dust mask is a thin and very supple disc about 5/8 inch in diameter, and it forms a perfect seal.You can make sure the valve is seated properly by placing your lips tightly against the seal housing on the inside of the mask and then trying to suck air in. You should get no air whatsoever if your lips are tight against the plastic housing and the seal is properly seated inside. If it isn't properly seated, the housing can be opened by holding the exterior valve housing with one hand while turning the interior housing CCW until it comes apart.Of course, the respirator with full polycarbonate lens offers eye protection too, and filters are available for blocking vapors as well as particles. But if your concern is breathing in fine particles, this BASE CAMP mask in my experience is superior to the expensive respirator because of the latter's "Achilles heel", its exhalation valve. I made sure there was no foreign matter keeping the respirator's valve from closing properly. The valve's imperfect seal was also a cause for concern among the medical profession, according to articles on NIH.govThe bridge of the BASE CAMP dust mask has a clip inside it which you can pinch to help form a good seal against your nose and face. When wearing the BASE CAMP mask, I had no problem with my $12 Pyramex safety glasses (which fit over prescription glasses) steaming up.

These seem like they are well made. I like the design - although colors other than dark ones would be nice. The filters seem thin but that's not a problem if they work. I really liked the breathing valves.HOWEVER - I have a small face. Small head (one size fits all hats are too big for me) and narrow face (ordinary medical type procedure masks gap so much they aren't effective unless I staple in a pleat or two to get a smooth fit). Using the measuring indicated on the product page, this mask should have fit. They do note that the fit of the filter is what's important, not necessarily the outer shell. But even this wasn't a good fit for me. I realize that it's probably a just-me thing, but these masks are not returnable. I previously bought the regular Base Camp M mask which was much too big - I could get two fingers in the gap under my chin. I bought this one because the specs are a little smaller. Still no good. So just be very cautious if you also have a small head or narrow face.In addition to a poor seal on the face, the arrangement of the straps was wrong for my face geometry. The upper strap that goes around the back of the head, if pulled tight enough to get a decent fit, pulls upward a lot, dragging the mask edge into my eyes. I wear glasses, and progressives at that, and this moved my glasses way out of alignment. So even if I thought the mask would do a good job filtering out particulates or pollen, I couldn't do any useful work while wearing it because I wouldn't be able to see.