Beach shop quality, I do not recommend trying to put this on a child. The strap does not stretch at all and cannot be adjusted when there are no locks of any kind on the edge of the mask. The mask is too deep and its soft parts are hard and the hard parts are soft. The lens is bad.
An equally small mask can be found in the "Aqua Sphere Combo Reef DX" package. Unlike this lousy infant mask, the Aqua Sphere mask is excellent.
The Aqua Sphere mask is very flexible, the strap is very flexible, the locks are good and easy to use and the lens is high quality and fog free. The Aqua Sphere mask is great for my 3.5 year old child.