Shorts bursts only
This is only good for short bursts of activity, like cleaning the litterbox or quickly spraying plants/ants outside. If you start having to breath heavy or keep it on too long you will get short on air and start to feel lightheaded. I can't imagine trying to walk around town or cycle, as is advertised, and I am in excellent shape so it's not like my cardiovascular strength is lacking. Pretty mask, but the usage is very limited. If you're thinking about wearing this all day or even for longer than 5 minutes forget it. Not to mention it fogs up glasses pretty badly. I use it mostly for cleaning the litterbox and would say it is a nice, easy-on reusable mask for that brief purpose.
Rating: 3 stars