My daughter is nearly four and i was finding that after a couple of uses, normal goggles were filling with water, and i didnt feel the vision for her as a learner was very good. I thought is would try this mask, and it has much better vision for her. Although after a few uses it also leaks, it doesnt seem as bad as goggles as the lens is so much bigger the water is further away from her eyes and easier to tip out.
The first few times she used this mask it didnt leak at all, so im not sure if it is something i have done, i throw it in her swimming bag after swimming it seems odd that it was ok initially, anyway it is still by far the best mask we have used.
My niece is extremely good at swimming, she is just 7, has been to swimming lessons, weekly, since she was a baby and has used lots of goggles, she borrowed these and now wants it instead of goggles due to the excellent vision and fit.