Our Lung Breathing Trainer equipment enhances breathing capacity, reduces fatigue and stress, and promotes overall well-being. There is scientific evidence to support that it can naturally lower blood pressure and enhance brain oxygenation, resulting in better sleep quality, experience unprecedented comfort and durability. Made from high-quality pure silicone material, the device is odorless and very flexible, ensuring comfort every time it is worn, and this well-built device is perfect for improving athletic endurance and improving your performance. A good choice for athletes, singers, smokers, etc