We bought the mask for our 5 1/2 year old son. The mask fits just so (much younger the child should not be based on average head size). The mask can be set super easy and remains tight while diving.
Meanwhile, our son is 7 1/2 years and the mask still fits. Despite frequent use of the mask is still in excellent condition and can be seen no signs of wear.
We are glad to have purchased this mask, not one of those cheap masks on the beach kiosk.
