My first mask was a neck gator made from some sort of microfiber. I would wear it doubled up. This is supposedly not a good mask choice anymore, but it also was hard to keep in place, it pressed down on my nose and restricted some air flow while cycling. I also had some N95 masks that I would use in higher risk areas, like the grocery store or Home Depot. It fit my face really well and I felt rather secure with it, however the ones I'd stored in the garage have the exhalation valve, which again is not recommended. I didn't try it while exercising but I suspect the air flow would be restricted to a degree and they might be uncomfortable for all day use.
Then, I googled recommendations for people who bike or jog and ordered three masks from Adidas for $20. with shipping. Black was sold out but they had blue, the only color choices. The Under Armor masks were also recommended but were sold out. It's made from recycled polyester that is sort of a stretchy light neoprene like material with a inner layer that looks like a filter pouch that's a lighter material. These are pretty comfortable. Super soft, lightweight, washable, fairly cool, and doesn't restrict breathing as much as the earlier masks. They do not have the metal strip that fits around the nose, so I did not feel like they fit as securely around the face. What I like about them is that they are easy to pull down when not needed. Say you're out walking and want a mask only when others are around but not all the time, the stretchy material makes them easy to pull up and down below the chin or nose as the situation requires. I haven't tried disposable or cotton masks, but these seem like they would be relatively comfortable to wear all day, for what they are. They tend to fog sunglasses when exercising. There are a few uTube reviews of these.
Thinking I might want to try something with a little tighter fit I saw the forums recommendation for the Beau Ties with the metal nose band and adjustable ear straps. $12 dollars from Amazon and free shipping. I ordered a dark red color which might have some visibility when cycling in traffic, but there were several fashionable colors and patterns. I've not received it yet.