OK, you may look a little scary with this on, but it’s actually a very innovative tool for taking athletes to the next level. The Training Mask 2.0 is an air tight silicone piece that covers your nose and mouth and is held on with a comfortable neoprene strap. There are 3 “resistance caps” that can be adjusted with various valves and caps to simulate altitude levels from sea level to 18,000 ft. The idea being that you can mimic high-altitude environments in order to condition your lungs, strengthen your diaphragm, and increase the surface area and elasticity in your alveoli. An interesting element to add to your training arsenal.