Mama's w/ littles in glasses. I need something for outside for summer, like when we go to the splashpad or water park that my 4. 5yo can wear in the water but not when he's like swimming under water, Some type of heavy duty sunglasses? Any of you have any ideas, we tried going w/ nothing and there were several times he couldn't find us because he really cannot see without them so I want something he feels comfortable that he isn't going to ruin if he's outside running and playing and in water. Thank you!