Review on 🏃 TRAININGMASK Training Mask 3.0 - Breathable Cardio Workout Mask for Running, Cycling, and Exercise – Black Training Mask by Justin Sherman

the mask works great. The only reason I'm not giving it 5 stars is because the face measurements aren't accurate. I measured my face and my wife measured my face and we double checked the measurements. I ordered a medium and it was too big. I didn't want to pay for a return postage (I don't think the customer should be responsible for the return postage) so I just ordered a small case. It works much better now, but the seal isn't always tight. When I called customer service to ask if I could buy the small black case or have it sent to me (because I didn't see any black cases on the online store) I was told that they don't only sell black cases. It was a bit of a headache. My advice, if you are unsure of your size, go smaller.