FDBRO Sport Masks Black for Fitness Running Training High Altitude Face Mask for Resistance,Cardio,Endurance Improving （One size）

• 【YOU WILL LIKE IT】: We use the food-grade silicone gel. Harmless to human body. It can be worn at ease. And our product have passed SGS international certification, which also passed european RoHS certification. It is harmless to human and environmental protection and this is our latest model based on 3 generations of workout mask. TIPS: The new product is sealed, please used after ventilation. Buy a suitable size for yourself :)
• 【BENEFITS】: Breathing is always the key. Altitude sport masks can help increase your lung capacity and make your exercise more effective by simulating high altitude exercise. The workout mask can cut your exercise time in half. It is very important to choose an elevation mask that suits you. Take your fitness, sport and game to the next level by adding the cardio mask into your workout routine.
• 【SIX LEVELS OF RESISTANCE】: Change your breathing intensity during exercise. This gym mask comes with a 6-level valve style, from light to extreme, depending on your endurance. FDBRO sport masks have already met customer needs very well. The high-quality Lycra fabric and harmless food-grade silicone gel are very suitable for any sport - cardio, including gym, cycling, running, high altitude training and elevation training, etc. You can exercise your breathing anywhere.
• 【DURABLE & RELIABLE】: Exercise mask is made from high quality ultra durable material. Made with sturdy elastic straps. The sport mask made of Lycra material and harmless food-grade silicone gel, which is more delicate and more skin-tight, a perfect combination. There will be no abnormal noise, no looseness.
• 【TRUSTWORTHY】: A Legacy In Customer Satisfaction--Born to be a quality controler, we cut no corners when it comes to quality. Feel free to contact our top-notch customer support team with any questions or concerns.

The general way of exercising the volume is nothing more than extending the training time and intensity, but the lungs are often ignored. To improve the body's function and capacity, not to strengthen the time can be achieved, but to exercise the lungs of the respiratory muscles (such as diaphragm and chest expansion muscles) to enhance the quality of each training, the body's potential to the apex. WHY USE FDBRO SPORT MASK? ★ Increase lung capacity ★ Enhance cardiac function ★ Improve oxygen absorption efficiency ★ Increase muscle strength ★ Increase physical and mental endurance ★ Improve training concentration ★ 6 levels of intensity, from light to extreme ★ Anatomical design, comfortable to wear