3M Rugged Comfort Half Facepiece Reusable Respirator 6503, NIOSH, Cool Flow Valve Helps Reduce Heat and Moisture, Silicone Faceseal Provides a Firm Seal, Welding, Sanding, Cleaning, Grinding, Large

As a safety professional, this is my brand of choice. Keep in mind that you will need the appropriate cartridges for the hazard you will deal with. Also, this needs to fit tightly against your face, but the adjustment on the straps make that straightforward.My main reason for preferring this respirator is the exhalation valve, which directs my breath away from my glasses. Along with the face seal material, that makes for a comfortable respirator. For the price, it is hard to beat.

Compared to cheaper masks, this really fits my face well and I don't detect any leaking around the edges. The cool flow valve really cuts down on the effort to breath and seems to keep the moisture under control. Strap system seems weird at first, but works quite well. I am wearing this under a ESAB Sentinel welding hood and although is is snug inside, I can lower the hood all the way and breath just fine. Doesn't block my vision at all. The nose piece does pushup my glasses a bit, but workable. A very worthwhile investment in my health. Highly recommended.

This one has the silicone rubber mask, so it conforms easily to your face without requiring a lot of tension on the straps. This makes it a lot more comfortable. The strap system is simple to use once you get the hang of it and there's no need for any adjustments once you set it up the first time. The large size probably makes sense for many guys and it fits me much better than the mediums. For everyday use, this mask works well with the 502, 603, and a pack of 5N11 filters.

I've been through a few different pairs of 3M particle filtering face masks. I do a lot of metal grinding. This is better than the previous ones I had, and the only thing that failed on them eventually was the elastic straps wear out. This one has rubber head straps and elastic neck straps. I foresee the straps wearing out on this before anything else. But it's still good for the price. This model does a particularly good job at not fogging my eye protection. Also the way the straps are designed, they don't interfere with eye protection around the ears like older ones did. Seal on the face is air tight and very comfortable.

Ordered during California wildfires when we had orange skies in the Bay Area (welcome to Mars!). It arrived quite fast, and I appreciate that very much.The great stuff: I was wearing the respirator when not in calls, since it muffles the voice a lot. Used a compatible cartridge for organic vapor/acid gas (6003/07047*) and I felt much better: less dizzy, clearer head, less tired. Fits very comfortably. Exhaled air is vented downwards, so this is good for COVID too.The downsides are: strong rubber smell and pressure where neck meets the back of the head. Wearing it leaves a red stripe on the nose bridge, where silicone is rubbing on it, which disappears fast.Nevertheless the benefits of this respirator mask make it a great purchase.

I couldnt tell you the model of my old 3M half face mask but this one seems to cover more area leading up to the breathing zone on my face and it seems to seal a lot better. I know my comparison is to my old one that I have had for years but I'm just saying. The main thing I liked is that while I wear it and I have on safety glasses also, my safety glasses aren't getting all fogged up just from me breathing like my old mask would do to me. To me that spoke volumes to how this thing seals. I actually came back and bought a smaller size mask for my girlfriend for when she gets carried away with the spray paint on her crafty whatever stuff. Something about refinishing rustic furniture maybe, idk what she calls it. She goes through probably 7 to 10 spray paint cans a month. I feel a lot better about her respiratory system with this mask on her face.

I work in attics and crawlspaces and this is definitely a must have. Very durable, reliable, great comfort and fitting

I've been using this mask with the slim pink P100s that fit under a welding mask for welding and plasma cutting. It is great. I had the garage door open, fans going, took a break - went back in without the mask and the smell hit bad. I put the mask right back on. Sweaty, hot, but it COMPLETELY blocked all the fumes. It was great.I tried a medium from an in-person store but the valves vibrated obnoxiously - getting this in small was the solution! A good fit is key. Make sure to do the no-filter test with the filter spots covered to make sure you get a good seal.If you can smell anything through the mask and you did a seal check first, then you need new filters or better filters for the job. If you can smell anything this mask is not working 100%.This version is NOT the quick release. I would get the quickly release next time because I often work around other people and no one can hear you until the seal is broken - which on this mask is pulling it slightly away from your face with one hand. The value of this mask though is that the quick release gets tighter when sealed, so it is a lot more work to get the straps right; this mask without quick release is a lot easier to get on comfortably.