Cevapro Snorkel Mask, Safe K2 Breathing System Full Face Snorkeling Mask for Natural Breath & Safe Snorkeling Anti Leak Anti Fog Diving Mask Dry Snorkel Set for Kids Adult (Blue-White, XS-Child)

It is very difficult to breath while in the water. It seems like the pressure of the water against the exhaust valve is high enough to cause considerable resistance. Perhaps eliminating the inlet valves will help to solve the problem.