Workout Training Mask for Running, Biking, Cycling, Cardio, Fitness, Achieve High Performance Altitude Elevation Effects with 4 Level Breathing Resistance

I bought these to modify as filtering masks. They are surprisingly comfortable compared to the one I got at a local sporting goods shop. Bands are maybe thinner material than I was expecting but so far no failures.

I have a small face so I have to keep my mouth open to get a good deal but other than that it works as expected.

Great worked very well