Training Mask Workout Breathing Mask for Men and Women - Adjustable Resistance Levels - Increase Lung Capacity and Endurance - Ideal for Jogging, Sports, Cycling, Fitness PREMIUM QUALITY MATERIALS: This training mask is made from superior quality, highly durable materials, with a sturdy construction which ensures a comfortable wearing experience. The highly breathable head sleeve fabric and elastic straps won’t loosen or deform and are guaranteed to withstand the test of time. With 24 breathing resistance levels which are easily adjusted according to your needs, this workout mask for men and women allows you to be in control of your workout intensity, without having to constantly adjust it due to unpleasant sliding. Brand new