Material: Waterproof fabric
Weight: About 520g
Color: Black, Silver
Size: S, M, L
Please note that when we ship the color of our shipment is random
thin and has low oxygen levels. Blood can not absorb oxygen normally as usual, and the heart rate increases.
Training in this ring, can enhance lung capacity, diaphragm, heart load intensity, anaerobic threshold.
So when you go back to low altitude, your performance or training will improve,
so most people will go to high altitude for training.