A
Aleta Bednar It works as intended, i will be using it when i go running so, if i have any complaints i will add those later.
C
Clorinda Terry worked as it should. happy with my purchase.
D
Daniele Lowe Works very well helps me breathe better and expanded my lungs
E
Elke Hilpert As described. I would recommend.
T
Taylor Wilkinson Restricts about 90% of your oxygen intake so it will truly put a tremendous stress on your lungs to help increase your vo2 max and lung capacity