Elevation Training Mask 2.0 - for Endurance - Increase Your Sports Performance, Endurance, Weight Lifting, Workout, Running Altitude Mask, Fitness Running, Manufactured in USA (Black, Small)

It provided excellent quality for what i wanted from it. It fits to the face comfortably and firmly without needing any adjustment. It’s a great product and i hope to keep building my stamina and cardio with it!

Breath feels relaxed after its use.