Review on FDBRO Fitness Training Mask 3.0 with Carry Box - High Altitude Face Mask for Running, Resistance, Cardio, Endurance Sports by Peter Zouhair

I bought another mask that was only one size but had problems right away. I had to fold and fasten the straps because the mask just wouldn't stay in place when I started sweating. I tracked this one down which suggested sizes. have a small Fit was great! The straps were comfortable and fit great. Doesn't slip at all when I start sweating. Stays in place no matter how fast I run. Very happy with it.