HIGHEST-QUALITY USED:Our breathing mask is made from superior quality material and stitched with perfection. It does not rip off easily and you won't face any holes or breakages. It is durable and lasts longer than some other masks available in the market. BOOST PERFORMANCE : Training sports mask makes workouts more effective by simulating high altitude, Toughening your diaphra and respiratory system, Control the airflow to breathe the muscles, thereby increasing the tension of the respiratory muscles. CHANGE RESISTANCE ON THE GO : Easily switch the resistance while you working out. No need to take your elevation mask off! Easy to disassemble, clean and wash