Workout Mask 3.0 4-Level Altitude Elevation Simulating Oxygen Resistance Training for Running Jogging Athletic Fitness Exercise
Increasing Lung Capacity -- By limiting the air supply, this mask helps improve the performance of your training, increasing your lung capacity and oxygen efficiency in a better effective way.
4-Level Resistance Valve System -- 4 inhaling resistance levels simulating different oxygen contents of 4,000ft/8,000ft/12,000ft/16,000ft altitudes, helps you achieve same effects as athletes from beginner to professor.
Premium Material -- Made of premium medical silicone and elastic fabric, super lightweight to avoid falling, well sealed and comfortable to wear.
One Size Fits Most -- Suits between 120 to 230 LBS. Works for all kinds of sports.
What You Get -- Package includes a full equipped elevation mask and an instructional booklet.