Great, needed it for acceleration and altitude training. Some claim it helps you work out harder and burn more calories. Yes and no but it's good for altitude training.

My husband was looking for another way to enhance his performance in MMA. This mask is an incredible addition to his training routine. It is well-made and fits him great. He is super satisfied with this mask.

This mask really gets the job done. I wanted to improve my cardiovascular strength and with this mask I was able to train better at sea level. It's a staple in my gym bag

I tried it for couple days during my training routine and I don’t feel any discomfort using it. It allows to breath well and doesn’t cause any inconvenient. Using it makes my workouts stress less as I feel protected and I can do workout in gym. Fabric seems solid and of good quality.

I like this product because it is practical in use. I use for work on the dock, walking, and will use it for the gym once it opens up. I want to expand the use of of my lungs and make them stronger. I am 66 and want to keep being fit for all sorts of activities which includes traveling to high altitude areas of the world.