(as of Feb 28,2021 02:01:15 UTC – Details)
✔ Comfortable ergonomic design: comfortable fabric, adjustable nose pads and Ve / cro (hook and loop fastener) closures can meet the specific needs of most people.
✔ Two valves block air: help to achieve the effect of high altitude and low air concentration conditions. This will increase the efficiency of your spirometry training to some extent.
✔ Awesome features: windproof and dustproof performance, usually suitable for people who like cycling, running or other outdoor activities.
✔ Our commitment: Our products are made of high-quality materials. If you have any questions about our products, please tell us, we will try our best to solve your problem after communicating with you.