The child (learning to swim) obviously had to take a few minutes with the new swimming mask fun upside down underwater, and to explore the "underwater world" of non-swimmers pool. A nice side effect: My daughter has a few minutes of swimming goggles even casually grasped the technique of breath-.
Now you can with Papa "dive" in common.
I myself have several "adult models" of swimming and diving masks (with nose pocket, as a substitute diving mask) of the company Aqua Sphere, and I am very satisfied with all models.
The only drawback point: The plastic glasses are not particularly scratch-resistant and require a little more cautious treatment (also applies to the "adult masks"), therefore a point deduction.