• FDBRO Training Mask simulates the effects of High Altitude Training
• The sport mask comes with a 6-level valve system, you can change the intensity of your breathing without removing your mask during your workout.  Better breathing while training.
• Function: Increase lung’s capability, strengthening the inspiratory and expiratory muscles,  enhance the function of the heart, enhance physical endurance as well as oxygen absorption efficiency.

**THESE ITEMS ARE NON-RETURNABLE**