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

According to the measurements on the website, the size turned out to be too big for my head. The sleeve slipped off the back of my head and pulled on my ears, forcing them to fold. Periodic adjustment was required during operation to prevent air leakage. I then ordered a sleeve one size smaller, but it was so tight that the pressure on my face hurt and my ears are still wrinkled. After contacting the manufacturer's customer service, I ordered a head strap, which actually turned out to be the solution: https://www.amazon.com/Training-Mask-Elevation-Head-Strap/dp/B0108MT0EQ/ I'm now returning the smaller sleeve.