Effective respiratory device for breathing and controlling the flow of air delivered into your body. The mask offers restrictive air flow through the flux valves. As your body adapts to this resistance of the mask you will learn to adapt and take deeper breaths whilst using oxygen more efficiently. Benefits of the mask include conditioning of the lungs by creating pulmonary resistance, strengthening of the diaphragm, increasing surface area and elasticity in alveoli, improved performance at respiratory compensation threshold, increased anaerobic threshold, increased oxygen efficiency, increased energy production, increased mental and physical stamina and increased mental focus. Simulated resistance elevation: 3,000ft-18,000ft. Top level athletes and coaches have started incorporating the mask into their programmes. Includes 6 x air resistance caps, 1 x silicone training mask and 1 x neoprene sleeve.